# Section 1: System Planning, Nutrition, Water, Facilities, and Daily Management ## Key Takeaways - **System planning and land assessment are foundational:** Success hinges on aligning production objectives (meat, wool, dairy) with land carrying capacity, determined by soil type, rainfall, and plant species, to establish appropriate stocking rates and avoid overgrazing which exacerbates parasite exposure. - **Nutrient requirements are stage-specific and forage-dependent:** Ewes in late gestation and early lactation have significantly higher energy and protein demands (up to 2-3 times maintenance) than dry ewes, necessitating supplementation beyond forage, which varies greatly in nutrient content based on maturity and species. - **Water provision is critical and often overlooked:** Sheep require 2-4 liters per 10 kg body weight daily, with needs escalating in hot weather and during lactation; water quality parameters like total dissolved solids (<5000 mg/L) and absence of fecal contamination are vital for intake and health. - **Facilities and daily management are integral to welfare and disease prevention:** Adequate housing ventilation to control ammonia (<25 ppm) and CO2 levels, secure fencing to prevent predation, and meticulous daily observation for early detection of clinical signs (e.g., lameness, coughing, listlessness) are essential. - **Biosecurity and record-keeping are paramount for disease control:** Implementing quarantine protocols for new animals (minimum 30 days) and maintaining detailed records of health treatments (including withdrawal dates), breeding outcomes, and deaths are crucial for preventing disease introduction and informing management decisions. --- Sheep farming begins with a coherent system designed around flock purpose, land capability, and sustainable management practices. Success depends on aligning nutrition, water, facilities, and daily routines with the physiological needs of sheep across production stages. This section provides a practical framework for planning and operating a sheep enterprise, drawing on standards from the [FAO animal production](https://www.fao.org/animal-production/en/) and [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) to guide evidence based decisions. ## At a Glance | Component | Key Considerations | | --- | --- | | System planning | Production objective, land carrying capacity, flock size, biosecurity zones | | Nutrition | Forage base, supplementation, [body condition scoring](/knowledge/animal-farming/farm-management/body-condition-scoring-a-tool-for-feed-management), mineral balance | | Water | Daily intake, quality parameters, winter access, trough sanitation | | Facilities | Housing ventilation, handling systems, fencing integrity, containment | | Daily management | Observation routines, grouping, record keeping, professional escalation | ## Table of Contents - System Planning for Sheep Flocks - Defining Production Objectives and Flock Type - Land Resource Assessment and Carrying Capacity - Flock Size and Structure Planning - Biosecurity Planning and Quarantine Protocols - Flock Nutrition Principles - Nutrient Requirements by Physiological Stage - Forage Types and Quality Management - Supplementation Strategies - Body Condition Scoring as a Management Tool - Water Provision and Quality - Daily Water Requirements - Water Quality Parameters and Testing - Winter Water Access and Freeze Prevention - Facilities Design and Management - Housing Systems and Ventilation - Handling Facilities and Working Safety - Fencing and Containment - Daily Management Routines - Observation and Early Detection - Movement and Grouping Decisions - Record Keeping and Documentation - Escalation Protocols and Professional Contacts ## System Planning for Sheep Flocks ### Defining Production Objectives and Flock Type Every sheep farming system should begin with a clear production objective. This decision determines breed selection, infrastructure requirements, and management intensity. The three primary production orientations are meat, wool, and dairy, each with distinct nutritional and facility demands. In many systems, a combined meat and wool enterprise is common, but the primary product should guide resource allocation. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) emphasizes that breed selection must match environmental conditions and market access to avoid chronic welfare and productivity problems. For meat production, terminal sire breeds such as Suffolk or Texel are used for lamb growth and carcass quality. For wool, fine wool breeds like Merino require more intensive health management and shearing schedules. Dairy sheep systems demand higher nutritional inputs and dedicated milking facilities. The objective also determines lambing frequency: accelerated systems with three lamb crops in two years require more intensive nutrition and management compared to once yearly lambing. Uncertainty exists regarding the optimal system for a given location, and new producers should consult extension specialists and review local market conditions before committing to a system. ### Land Resource Assessment and Carrying Capacity Land is the fundamental resource in sheep farming. An accurate assessment of forage production capacity is required to set stocking rates and avoid overgrazing, which degrades pasture and increases parasite exposure. The [FAO animal production](https://www.fao.org/animal-production/en/) guidelines recommend a systematic evaluation of soil type, rainfall pattern, and plant species composition to determine carrying capacity. This is expressed as the number of ewe equivalents per hectare per year. Carrying capacity varies widely by region. In temperate improved pastures, a typical range is 6 to 10 ewes per hectare. In arid or marginal rangelands, carrying capacity may drop below 1 ewe per 10 hectares. These figures are not rules but examples, actual capacity must be calculated from local conditions. A conservative starting point is recommended, with adjustment after two to three grazing seasons. The decision path for determining carrying capacity involves: 1. Measure total grazeable area in hectares 2. Estimate annual forage yield in kilograms of dry matter per hectare 3. Deduct 20 percent for buffer and wildlife 4. Divide by annual forage requirement per ewe plus lamb 5. Adjust for seasonal variation and drought risk Records to keep include paddock area, forage yield estimates, grazing days per paddock, and residual sward height. These data allow progressive refinement of stocking rates. Overestimation of carrying capacity is a common source of undernutrition, increased parasite burden, and soil degradation. Producers should consult with a grassland agronomist or extension specialist for site specific advice. ### Flock Size and Structure Planning Flock size should align with land area, labor availability, and market demand. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) data indicate that many sheep operations in the United States have fewer than 100 ewes, but economic viability often requires a minimum scale depending on enterprise type. For meat production, a flock of 200 ewes is a common threshold for part time to full time income, with lower thresholds for wool or dairy. Flock structure refers to the age distribution of ewes. A productive flock typically has 15 to 20 percent ewe lambs entering the breeding group each year, with culling of older ewes for age or reproductive failure. The Merck Veterinary Manual notes that ewe fertility peaks between ages three to six, and culling after seven years is common. The ram to ewe ratio should be 1 to 40 for mature rams and 1 to 25 for ram lambs, adjusted for breed and condition. These ratios are general guidelines and should be adapted based on ram fertility testing before breeding. Records to maintain include an inventory sheet with identification numbers, birth dates, dam and sire, and annual breeding outcomes. These records inform culling and replacement decisions. Uncertainty exists about optimal culling rates, producers should review their records annually and adjust based on replacement availability and market conditions. ### Biosecurity Planning and Quarantine Protocols Biosecurity is a planned approach to prevent disease introduction and spread. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) provide comprehensive guidance on quarantine, movement control, and health monitoring. For sheep farms, the key elements are: - Quarantine all new animals for a minimum of 30 days - Separate quarantine area must be downwind and downhill from main flock - Use dedicated equipment and footwear for quarantine area - Test new animals for common diseases such as caseous lymphadenitis, ovine progressive pneumonia, and footrot before introduction - Maintain a visitor log and disinfect vehicles entering the farm A biosecurity decision path for new introductions: 1. Purchase animals from herds with known health status 2. Transport directly to farm, do not allow contact with other animals 3. Unload into quarantine area 4. Perform initial health examination and testing 5. Monitor daily for clinical signs 6. Treat for internal and external parasites 7. Integrate after quarantine period if no disease detected If clinical signs develop during quarantine, a veterinarian should be consulted immediately. The quarantine period also provides an opportunity to vaccinate or boost immunity before mixing with the main flock. Worker safety during quarantine involves wearing gloves when handling animals, using proper restraint, and disinfecting hands and clothing after contact. Food safety is indirectly supported by biosecurity because it reduces the need for antimicrobial treatments that could lead to residues or resistance. Records to keep include date of arrival, source farm, transport details, quarantine start and end dates, test results, and any treatments administered. Uncertainty surrounds the required length of quarantine for different diseases, longer periods are safer but logistically difficult. A veterinarian can provide a risk assessment based on source herd history and local disease prevalence. ## Flock Nutrition Principles ### Nutrient Requirements by Physiological Stage [Sheep nutrition](/knowledge/animal-farming/sheep/sheep-nutrition-feeding-for-health-and-productivity) must be matched to physiological stage to support health, reproduction, and production. The Merck Veterinary Manual outlines that nutrient needs vary dramatically between maintenance, late gestation, lactation, and growth. A ewe in early gestation may require only maintenance rations, while a ewe with twin lambs in late lactation requires two to three times the energy and protein of a dry ewe. The table below summarizes relative nutrient demand by stage. | Stage | Energy requirement | Protein requirement | Critical minerals | | --- | --- | --- | --- | | Dry ewe maintenance | Baseline | Baseline | Salt, phosphorus | | Early gestation | Baseline to moderate | Baseline | Salt, copper, selenium | | Late gestation | High | High | Calcium, phosphorus, magnesium | | Early lactation | Very high | Very high | Calcium, phosphorus, salt | | Lamb growth | High | High | Copper, selenium, zinc | | Ram breeding | Moderate to high | Moderate | Selenium, zinc, salt | All values should be adjusted based on ewe body condition, litter size, and environmental temperature. Cold stress increases energy requirements significantly. The FAO animal production guidance emphasizes that feeding according to stage reduces metabolic disorders and improves lamb survival. Producers should formulate rations with the help of a nutritionist to ensure adequate energy density and protein content without causing acidosis or obesity. Uncertainty exists about the exact nutrient content of forages, which varies with plant species, maturity, and harvest conditions. Forage testing by a certified laboratory is the only reliable way to determine actual nutrient content. A nutritionist should interpret test results and adjust supplementation accordingly. ### Forage Types and Quality Management Forage is the foundation of sheep nutrition. Legumes such as clover and alfalfa offer high protein and energy, while grasses like ryegrass and fescue provide bulk fiber. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources note that pasture quality declines with maturity, and rotational grazing helps maintain digestibility and intake. Managed grazing with rest periods of 21 to 30 days allows regrowth and reduces parasite reinfection. Forage quality assessment includes: - Crude protein content - Neutral detergent fiber - Acid detergent fiber - Dry matter yield per hectare - Presence of toxic plants such as bracken fern or ragwort A decision path for forage management: 1. Soil test annually and apply fertilizer or lime based on recommendations 2. Graze paddocks when forage height reaches 10 to 15 cm for grass and 20 to 25 cm for legumes 3. Remove sheep when residual height reaches 5 to 8 cm 4. Rest paddock until regrowth reaches target height 5. Mow or harrow after grazing to control weeds and spread manure 6. Test forage quality before feeding as hay or silage Records to keep include soil test results, fertilizer application dates and rates, grazing dates per paddock, and forage test results. These records inform long term pasture improvement decisions. Uncertainty about rainfall and growing conditions means that producers should have contingency forage such as hay or silage for drought periods. ### Supplementation Strategies Supplementation is required when forage alone does not meet nutrient demands. Common supplements include grain concentrates, protein meals, mineral mixes, and vitamins. The Merck Veterinary Manual warns against sudden changes in concentrate feeding to avoid ruminal acidosis. Introduction should occur over 5 to 7 days. The decision to supplement should be based on: - Forage quality test results - Body condition score average for the flock - Physiological stage - Weather conditions For late gestation ewes carrying multiple lambs, energy supplementation with corn or barley is typical. Protein supplementation with soybean meal or canola meal may be needed if forage protein is below 10 percent. Mineral supplementation should be tailored to local deficiencies. The FAO animal production guidelines note that selenium and copper deficiencies are common in many regions and can cause white muscle disease and swayback, respectively. A simple supplementation decision path for ewes in late gestation: 1. Score body condition of all ewes 2. Separate ewes scoring below 2.5 into a higher plane of nutrition group 3. Offer 0.2 to 0.5 kg of concentrate per ewe per day starting 4 weeks before lambing 4. Increase to 0.5 to 1.0 kg per day in the last 2 weeks 5. Continue through early lactation If ewes are still losing body condition despite supplementation, a veterinarian or nutritionist should be consulted to evaluate ration formulation and health status. Food safety considerations require observation of withdrawal periods if medicated feeds are used. Records to keep include type and amount of supplement offered per group, dates, and body condition scores. ### Body Condition Scoring as a Management Tool Body condition scoring is a hands on method to assess energy reserves in sheep. It is a more reliable indicator than visual appraisal alone. The Merck Veterinary Manual describes a 5 point scale where 1 is emaciated and 5 is obese. The optimal target score varies by stage: - Dry ewes: 2.5 to 3.0 - Ewes at breeding: 3.0 to 3.5 - Ewes at lambing: 3.0 - Ewes at weaning: 2.5 Scoring is performed by palpating the loin area over the vertebrae and the short ribs on both sides. The touch identifies the sharpness of the spinous processes and the amount of fat cover. Scoring should be performed at key points in the annual cycle: before breeding, mid gestation, at lambing, and at weaning. A decision path based on body condition scoring results: 1. If average score is below target, increase energy intake for the group 2. If individual scores are below 2.0, separate and provide intensive feeding 3. If average score is above 3.5, reduce energy intake to avoid metabolic problems 4. If scores are highly variable within a group, review feeding space and competition Records to keep include individual or group scores at each assessment point, date, and any feeding changes made. These records allow tracking of nutritional management effectiveness over time. Uncertainty exists in scoring consistency between observers, training with an experienced scorer or veterinarian improves reliability. ## Water Provision and Quality ### Daily Water Requirements Water is the most critical nutrient and is often overlooked. Sheep require 2 to 4 liters of water per 10 kg of body weight per day, depending on temperature, feed type, and production stage. Lactating ewes may need twice the water of dry ewes. The [FAO animal production](https://www.fao.org/animal-production/en/) guidelines emphasize that water intake increases dramatically in hot weather and during dry feed consumption. Actual water consumption varies, and the following factors increase demand: - Ambient temperature above 25 degrees Celsius - High fiber or dry forage diets - Lactation - Fever or illness A decision path for water provision: 1. Calculate total daily water requirement for the flock based on body weight and stage 2. Ensure water flow rate to troughs or tanks is sufficient to allow all animals to drink within 2 hours 3. Provide at least 2 drinking points per group to reduce competition 4. Inspect water sources daily for flow and cleanliness 5. Clean troughs weekly to prevent algae and biofilm If water consumption drops suddenly, this may indicate poor water quality or disease. A veterinarian should be alerted if reduced intake is accompanied by other clinical signs. Records to keep include water source type, flow rate, cleaning schedule, and any water quality test results. ### Water Quality Parameters and Testing Water quality affects feed intake and health. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) note that water should be free from fecal contamination, heavy metals, and toxins. Key parameters include: - Total dissolved solids below 5000 mg/L for sheep (lower for sheep than for cattle) - pH between 6.5 and 8.5 - Nitrate below 200 mg/L - Sulfate below 1000 mg/L - Coliform bacteria count as an indicator of fecal contamination Water sources such as ponds, streams, or wells should be tested at least annually. Testing should be performed by a certified water testing laboratory. If water quality parameters are outside recommended ranges, a water engineer or extension specialist should be consulted for treatment options. Records to keep include water test dates, results, and any corrective actions taken. Uncertainty exists about the exact tolerance of sheep for certain minerals, which can vary by breed and adaptation. However, routine testing provides a baseline for management decisions. Worker safety when handling water treatment chemicals requires following label instructions and using protective equipment. ### Winter Water Access and Freeze Prevention In cold climates, water access can become a major welfare issue. Sheep require water even in freezing conditions, and dehydration in winter reduces feed intake and body condition. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) data indicate that winter water availability is a common management challenge. Winter water strategies include: - Heated water troughs with thermostatic control - Breaking ice on ponds or tanks at least twice daily - Insulated water lines or heated bucket systems - Providing warm water if possible to stimulate intake A decision path for winter water management: 1. Identify water sources that are most vulnerable to freezing 2. Install heated units or insulation before temperatures drop below freezing 3. Check water availability at each feeding time 4. If water is frozen, break and remove ice, then provide fresh water 5. If using heated units, inspect electrical connections for safety If water intake cannot be maintained, sheep welfare is compromised and veterinary attention should be sought. Worker safety during winter includes risks of slipping on ice, hypothermia, and electrical shock from heating devices. Records to keep include daily temperature and water availability inspection notes. ## Facilities Design and Management ### Housing Systems and Ventilation Housing is required for lambing, winter shelter, and protection from extreme weather. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) state that housing must provide adequate space, ventilation, and drainage to prevent respiratory disease and foot problems. Space recommendations vary by system. For intensive housing, each adult ewe should have 1.5 to 2.0 square meters of floor space. For lambing pens, 2.0 to 3.0 square meters per ewe and lambs. These are guidelines and should be adjusted based on climate and bedding management. Overcrowding increases ammonia levels and respiratory disease risk. Ventilation is critical in enclosed housing. Natural ventilation using ridge openings and side curtains is common. Mechanical ventilation may be needed in areas with low wind. Carbon dioxide and ammonia levels should be monitored. The Merck Veterinary Manual notes that ammonia levels above 25 ppm can cause respiratory damage. A decision path for housing assessment: 1. Measure ammonia and carbon dioxide levels inside the housing 2. Look for condensation on ceilings and walls, which indicates poor ventilation 3. Observe sheep for coughing, nasal discharge, or eye irritation 4. Adjust ventilation openings to improve air exchange without creating drafts 5. If problems persist, consult a building engineer or extension specialist Records to keep include housing dimensions, number of animals housed, bedding type and changes, and any ventilation adjustments. Animal welfare in housing includes providing dry bedding, adequate light, and space to lie down and move freely. Worker safety in housing includes using proper lifting techniques for bedding and manure handling, and providing lighting for dark areas. ### Handling Facilities and Working Safety Handling facilities reduce stress and injury for both sheep and workers. The [FAO animal production](https://www.fao.org/animal-production/en/) guidelines recommend a well designed handling system with a race, forcing pen, and a holding area. Key design principles include: - Solid sides on races and pens to restrict vision and reduce fear - A non slip floor surface - Gradual curves to encourage forward movement - A head gate or foot bath at the race end Worker safety is a primary concern in handling facilities. Sheep can kick, crush, and cause falls. Safe work practices include: - Wearing appropriate footwear with good traction - Avoiding loose clothing that can catch on equipment - Using a sturdy staff or sorting board, not electrical prods - Having an escape route in pens - Never working alone with rams The Merck Veterinary Manual emphasizes that rams can be dangerous and should be handled with caution. A decision path for ram handling: 1. Approach from the side, not directly from the front 2. Use a handling facility for veterinary procedures 3. Keep rams in separate pens or with quiet ewes 4. Never turn your back on a ram If a worker is injured, seek medical attention immediately and report the incident. Records to keep include any injury reports, safety training dates, and facility maintenance records. Uncertainty exists about optimal facility design for different flock sizes, visiting other farms and consulting with extension specialists can inform design choices. ### Fencing and Containment Fencing is essential for controlling grazing, preventing predation, and moving animals between paddocks. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources note that predator control is a major concern for sheep producers. Fencing options include woven wire, high tensile electric, and portable electric netting. A decision path for fencing selection: 1. Assess predator pressure: coyotes, wolves, dogs, or foxes 2. Evaluate terrain and soil type for post installation 3. Choose fence height: 1.0 to 1.2 meters for sheep, higher for predator exclusion 4. For predator control, use woven wire with electric offset or multiple strands 5. Inspect fences weekly for damage and vegetation contact Records to keep include fence type, length, maintenance schedule, and any predator incursions. If predation occurs, contact a wildlife specialist or USDA APHIS Wildlife Services for assistance. Worker safety when building or repairing fences includes wearing safety glasses for stretched wire, using proper tools, and being aware of electrical hazards with electric fences. ## Daily Management Routines ### Observation and Early Detection Daily observation is the foundation of flock health management. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) recommend that all sheep be observed at least once daily for signs of illness, injury, or behavioral change. Observation should be performed at a consistent time, ideally when sheep are resting or feeding. Key observations include: - Appetite: are all animals eating and drinking? - Behavior: listlessness, isolation, head down, grinding teeth - Body condition: any dramatic changes? - Lameness: counting affected animals - Coughing, nasal discharge, ocular discharge - Fecal consistency and evidence of scours A decision path for abnormal findings during observation: 1. Identify and isolate affected animal 2. Conduct a basic health exam including temperature, respiration rate, and rumen fill 3. If one animal is affected, monitor and consider treatment if condition worsens 4. If multiple animals are affected, escalate to a veterinarian 5. Record findings in daily log If an animal is found dead, perform a basic check for signs of trauma, bloat, or birthing difficulty. Contact a veterinarian for necropsy to determine cause, especially if multiple deaths occur. Records to keep include a daily log of observations, clinical signs, treatments, and veterinary consultations. Early detection reduces the impact of disease and supports welfare. ### Movement and Grouping Decisions Grouping sheep by physiological stage reduces competition and allows targeted feeding. The Merck Veterinary Manual states that grouping should be based on body condition, stage of gestation, litter size, and health status. Groups should be stable to reduce social stress. Common grouping strategies include: - Dry ewes: maintained in large groups on lower quality forage - Pregnant ewes: grouped by expected lambing date for convenience - Lactating ewes: kept with lambs for bonding - Growing lambs: separated from ewes at weaning A decision path for regrouping: 1. Evaluate current groups and their nutritional needs 2. Plan regrouping at least 2 weeks before a critical stage change such as lambing 3. Move sheep quietly and in small groups to a new pen 4. Provide fresh feed and water immediately 5. Observe for fighting or bullying for 24 hours If aggression is observed, provide additional feeding space and escape areas. Records to keep include group composition, dates of regrouping, and any welfare issues noted. Worker safety during movement includes using slow, calm movements and avoiding sharp turns. ### Record Keeping and Documentation Accurate records are essential for management decisions, health planning, and compliance. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) provides templates for flock records. Essential records include: - Individual animal identification with a unique tag or tattoo - Breeding dates and lambing outcomes - Health treatments with product, dose, route, and withdrawal dates - Deaths and necropsy results - Feed purchases and forage test results - Water quality test results - Veterinary consultation notes Records should be kept for at least 3 years, or longer if required by local regulations. A decision path for record keeping: 1. Choose a system: paper ledger, spreadsheet, or farm management software 2. Assign responsibility to one person for data entry 3. Review records monthly to identify trends 4. Use records to plan culling, feeding, and breeding If records show a pattern of poor performance, consult a veterinarian, nutritionist, or extension specialist for analysis. Uncertainty exists about the best record format, the most important factor is consistency. Worker safety includes protecting physical records from weather and pests, and backing up digital records regularly. ### Escalation Protocols and Professional Contacts The care of a sheep flock requires access to a network of professionals. The appropriate escalation point depends on the issue. The table below summarizes typical contacts. | Issue type | Primary contact | Secondary contact | | --- | --- | --- | | Disease outbreak or unexplained deaths | Veterinarian | Veterinary diagnostic laboratory | | Nutritional deficiencies or imbalances | Nutritionist | Feed company representative | | Forage quality or grazing management | Extension specialist | Grassland agronomist | | Water quality problems | Water engineer | Extension specialist | | Reproductive failure | Veterinarian | Theriogenologist | | Predator problems | USDA APHIS Wildlife Services | Local trapper | | Facility design or ventilation | Building engineer | Extension specialist | A decision path for when to escalate: 1. If a problem affects more than 5 percent of the group, contact a veterinarian 2. If a single animal fails to ## Flock Nutrition and Feeding Management Nutrition is the foundation of flock health, productivity, and welfare. A feeding program that matches the nutrient requirements of each production stage reduces disease risk, improves lamb survival, and supports efficient growth. This section covers the principles of sheep nutrition, feed quality assessment, feeding strategies for different classes of sheep, and the integration of nutrition with grazing management. The guidance is general and educational. Specific diets must be formulated by a qualified nutritionist based on feed analysis and flock conditions. ### Nutrient Requirements by Production Stage Sheep have different nutrient needs depending on their physiological state. The five main categories are maintenance, gestation, lactation, growth, and ram breeding condition. A flock nutrition plan should account for these differences to avoid underfeeding or overfeeding, both of which carry welfare and economic consequences. #### Maintenance Maintenance is the energy and protein required to keep a mature sheep alive without weight change or production. This is the baseline for dry ewes, wethers, and rams outside the breeding season. Maintenance requirements are affected by body weight, fleece growth, activity level, and environmental temperature. Cold weather, wind, and wet conditions increase energy needs. The Merck Veterinary Manual [Merck Veterinary Manual](https://www.merckvetmanual.com/) advises that maintenance rations must provide sufficient digestible energy and crude protein, typically 8 to 10 percent crude protein on a dry matter basis for mature sheep. For most flocks, maintenance is met by good quality forage alone. However, forage quality declines with maturity, and poor hay or low quality pasture may fail to meet even maintenance levels. A decision path for assessing maintenance feeding: 1. Body condition score all ewes at least 30 days after weaning. 2. If ewes are in condition score 3 or 4 (on a 1 to 5 scale), maintenance feeding is adequate. 3. If ewes are below condition score 3, increase feed quality or quantity. 4. If ewes are above condition score 4, reduce energy intake to prevent obesity, which impairs reproduction and lambing. #### Gestation Pregnancy imposes increasing nutrient demands. The first two thirds of gestation (early to mid pregnancy) require only a moderate increase in energy and protein above maintenance. The last six weeks of gestation (late pregnancy) are critical because the fetus grows rapidly and the ewe must also produce colostrum. This period has the highest risk of metabolic disease, particularly pregnancy toxemia (ketosis) and hypocalcemia. [FAO animal production](https://www.fao.org/animal-production/en/) resources highlight that energy requirements in late pregnancy can be 1.5 to 2 times maintenance. Protein requirements also increase to support fetal growth and udder development. A common failure pattern is underfeeding energy in the last month, leading to weak lambs, poor colostrum quality, and increased lamb mortality. Overfeeding energy in early pregnancy can cause excessive fat deposition and reduce lambing ease. A decision path for gestation feeding: 1. Group ewes by body condition score at breeding. Ewes in condition score 3 to 3.5 are ideal. 2. During early gestation, feed good quality forage to maintain condition. Do not allow weight loss. 3. At 6 weeks before the first expected lambing date, introduce a higher energy concentrate or better quality forage. Increase gradually over 2 weeks to avoid rumen upset. 4. Monitor for signs of pregnancy toxemia: depression, teeth grinding, blindness, or recumbency. Contact a veterinarian immediately if suspected. #### Lactation Lactation is the most nutrient demanding period for ewes. A ewe with a single lamb requires approximately double the energy of maintenance. Ewes with twins or triplets need even more. The first 4 to 6 weeks of lactation are the peak demand period. If nutrient intake is insufficient, the ewe mobilizes body reserves, leading to weight loss and reduced milk production. Lamb growth rate slows, and lamb mortality increases. [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) reports from the National Animal Health Monitoring System indicate that inadequate lactation nutrition is a frequent contributor to pre weaning lamb losses. A well designed lactation ration should provide 14 to 18 percent crude protein on a dry matter basis and sufficient energy. Forage alone rarely meets lactation needs, supplementation with grain or commercial concentrate is typical. A decision path for lactation feeding: 1. Feed ewes to appetite starting immediately after lambing. 2. Offer free choice good quality hay or pasture plus a concentrate at a rate of 0.5 to 1.5 kg per head per day, depending on litter size and feed quality. 3. Provide fresh water at all times. Water intake directly influences milk production. 4. Monitor lamb growth rates weekly. If lambs are not gaining 200 to 300 grams per day on average, evaluate the ewe's feed intake and milk supply. #### Growing Lambs Lambs begin to consume solid feed at about 2 weeks of age. A creep feed (a high energy, high protein supplement offered to lambs but not to ewes) supports rumen development and growth. Lambs destined for slaughter should reach target weight by 4 to 6 months. Replacement ewe lambs should be grown at a moderate rate to avoid excessive fat deposition, which can impair future fertility. [Merck Veterinary Manual](https://www.merckvetmanual.com/) emphasizes that creep feed should contain 16 to 18 percent crude protein and be palatable. Whole grains such as corn, barley, or oats can be used, but processing (rolling or cracking) improves digestibility. The feed must be kept clean and dry to prevent mold and reduce the risk of coccidiosis. A decision path for lamb feeding: 1. Start creep feed in a creep area that excludes ewes by 2 weeks of age. 2. Offer fresh feed daily. Remove uneaten feed and clean troughs. 3. Weigh a sample of lambs every 2 weeks to track growth. 4. If growth falters, check feed quality, water availability, and health status. Consult a veterinarian if scours or coughing is present. #### Rams Rams require a maintenance ration most of the year, but their nutritional needs increase 4 to 6 weeks before the breeding season. Adequate energy and protein support semen quality and libido. Rams that are too fat or too thin have reduced fertility. The target body condition score for rams is 3 to 3.5. [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) recommends monitoring ram condition and feeding a concentrate supplement if needed to reach ideal condition by breeding time. A decision path for ram feeding: 1. Body condition score rams 2 months before breeding. 2. If below condition score 3, increase feed quality. Provide a grain supplement at 0.5 to 1 kg per day depending on forage quality. 3. If above condition score 4, reduce energy intake. Rams in heavy condition may become lazy and less effective at breeding. 4. Provide access to exercise. Confinement and overfeeding lead to foot problems and poor libido. ### Feed Types and Quality Assessment The main feed categories for sheep are forages (pasture, hay, silage), concentrates (grains, protein meals), byproducts (beet pulp, distillers grains), and minerals/vitamins. Each category has variable nutrient content. Regular feed analysis is the only reliable way to know what a feed provides. #### Forage Quality Forage should be the primary component of a sheep diet. Good quality forage supports rumen health and reduces the need for concentrate supplements. Forage quality is determined by stage of maturity at harvest. Legumes such as alfalfa and clover have higher protein and energy than grasses. However, legume forages can cause bloat if fed as the sole ration without adaptation. The National Animal Health Monitoring System [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) surveys have identified that many forage samples tested from sheep farms are lower in protein and energy than expected, especially from grass hay cut after seed head emergence. A forage test from a certified laboratory provides dry matter, crude protein, neutral detergent fiber, acid detergent fiber, and mineral content. With these values, a nutritionist can balance rations. A decision path for forage management: 1. Test every new batch of hay or silage before feeding. 2. Store hay under cover to prevent rain damage and mold growth. 3. Feed hay in racks or feeders to reduce waste and prevent contamination with feces and soil. 4. If forage quality is poor (crude protein below 8 percent, acid detergent fiber above 40 percent), supplement with a protein or energy source. #### Concentrates and Supplements Grains are energy dense but low in protein and some minerals. Protein meals such as soybean meal, canola meal, or cottonseed meal provide supplemental protein. Commercial sheep feeds are often pelleted and formulated to provide a balanced ration when fed with forage. The use of non protein nitrogen sources such as urea is possible but requires careful mixing and adaptation. Urea toxicity is a risk. The Merck Veterinary Manual [Merck Veterinary Manual](https://www.merckvetmanual.com/) advises that urea should not exceed 1 percent of the total diet dry matter and must be uniformly mixed. Minerals and vitamins are essential. Sheep require salt, calcium, phosphorus, magnesium, potassium, sulfur, and trace minerals such as copper, selenium, zinc, and manganese. The correct balance is important. For example, copper is needed but can be toxic to sheep because they excrete copper poorly. Many commercial sheep mineral mixes are formulated with lower copper levels than cattle minerals. Selenium deficiency causes white muscle disease, and supplementation is common in selenium deficient regions. Vitamin A and E are important for immune function and reproduction. A decision path for mineral feeding: 1. Provide free choice a sheep specific mineral supplement. 2. Do not feed cattle minerals to sheep unless the copper concentration is safe for sheep. 3. In areas known to be deficient in selenium or other trace minerals, use an injectable product or incorporate into the mineral mix as directed by a veterinarian. 4. Monitor for signs of deficiency: poor growth, rough coat, stiffness, or reproductive failure. If suspected, work with a veterinarian to test blood or tissue levels. ### Feeding Strategies and Ration Formulation Ration formulation is the process of combining feedstuffs to meet the nutrient requirements of a specific group of sheep. The goal is to provide the right amount of nutrients without over or underfeeding. Rations can be total mixed rations (TMR) or separate feeding of forage and concentrate. TMR is more common in intensive systems. Extensive systems often rely on pasture plus occasional supplement. A decision path for choosing a feeding system: 1. Determine the flock size and available labour. TMR requires mixing equipment and consistent management. 2. Assess forage availability and quality. If pasture is abundant and high quality, minimal supplementation is needed. 3. If the flock includes multiple production stages, group feeding is usually necessary. Separate pens for dry ewes, pregnant ewes, lactating ewes, and lambs allow targeted feeding. 4. Consult a nutritionist if the ration is complex or if performance is below target. #### Feed Budgeting and Pasture Allocation Feed budgeting is the practice of matching feed supply to demand over time. This is especially important for pasture based systems where forage growth is seasonal. Overgrazing reduces pasture regrowth and can lead to soil erosion. Underutilization wastes feed and reduces pasture quality as plants mature. [FAO animal production](https://www.fao.org/animal-production/en/) resources recommend calculating the total digestible energy available from pasture and comparing it to the flock's requirements. A simple method is to estimate pasture dry matter per hectare and subtract a 30 percent wastage allowance. Then divide by the daily dry matter intake per sheep (about 2 to 4 percent of body weight depending on production stage) to estimate how many sheep days the pasture can support. A decision path for pasture allocation: 1. Measure pasture height before turning sheep into a paddock. Use a rising plate meter or sward stick if available. 2. Set target pre grazing height: 8 to 12 cm for leafy grass clover pastures, 15 to 20 cm for stemmier grass pastures. 3. Remove sheep when pasture height reaches 4 to 6 cm. This residual height allows for regrowth. 4. Rotate paddocks to allow rest periods. Rest period length depends on season, typically 2 to 4 weeks. 5. If pasture growth is insufficient, supplement with hay or silage. Do not let sheep graze below the residual height. ### Water Water is the most essential nutrient. Sheep will drink 4 to 15 litres per day depending on size, production stage, weather, and feed moisture content. Lactating ewes and lambs have high demands. Water quality affects intake. Dirty, warm, or stagnant water reduces consumption and can cause health problems. Sulfates, nitrates, and bacterial contamination are common concerns. A decision path for water management: 1. Test water at least annually for total dissolved solids, nitrates, sulfates, and coliform bacteria. A water quality test from a certified laboratory is recommended. 2. If nitrate nitrogen exceeds 10 ppm, consult a veterinarian or extension specialist. High nitrates can cause methemoglobinemia. 3. If sulfate exceeds 500 ppm, consider alternative water sources. High sulfates can reduce copper absorption and cause diarrhea. 4. Clean water troughs regularly. In hot weather, check troughs daily for algae buildup. 5. Provide water in shaded areas in summer. In winter, break ice and ensure water is not frozen. ### Common Nutritional Failure Patterns Several recurring problems in sheep flocks have nutritional causes. Recognizing these patterns allows early intervention. #### Pregnancy Toxemia Pregnancy toxemia occurs in late gestation when energy intake is insufficient. Ewes with multiple fetuses are most at risk. Clinical signs include depression, loss of appetite, teeth grinding, and neurologic signs. Treatment requires immediate veterinary assistance. Prevention is through proper body condition at breeding and adequate energy intake in late pregnancy. #### Hypocalcemia (Milk Fever) Hypocalcemia is most common in lactating ewes, especially those with heavy milk production. Signs include weakness, recumbency, and neck rigidity. Treatment is calcium injection by a veterinarian. Prevention involves providing adequate calcium in the diet and avoiding high potassium forages that reduce calcium availability. #### White Muscle Disease White muscle disease is caused by selenium and/or vitamin E deficiency. It affects lambs and growing sheep. Signs include stiffness, weakness, and sudden death. Prevention is through selenium supplementation to ewes during gestation and to lambs shortly after birth. Consult a veterinarian to confirm deficiency with blood tests. #### Copper Toxicity Copper toxicity is a risk when sheep receive feeds or minerals with high copper levels. Signs are not obvious until late stages, when jaundice, depression, and death occur. Prevention is straightforward: use sheep specific mineral supplements. If cattle minerals are accidentally fed, stop immediately and contact a veterinarian. There is no safe treatment once clinical signs appear. #### Bloat Bloat can occur on legume rich pastures or when feeding large amounts of grain. Frothy bloat is the most common type in sheep. It is a medical emergency. Prevention includes gradual introduction to legume pastures, providing access to grass hay before turning onto legumes, and using bloat preventing agents such as poloxalene if risk is high. ### Welfare Implications of Nutrition Nutrition directly affects sheep welfare. Hunger and malnutrition are welfare issues. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) include provisions for adequate feed and water in animal welfare codes. Poor nutrition leads to metabolic disease, weakened immune function, and increased susceptibility to parasites and infections. Body condition scoring is a practical tool for monitoring welfare. Ewes that are too thin (condition score less than 2) or too fat (condition score greater than 4) are at higher risk of health problems. A scoring system should be used consistently by the same person to reduce variation. Records of condition scores help detect trends. A decision path for welfare monitoring: 1. Score body condition at least twice per year: at weaning and at the start of late pregnancy. 2. If more than 10 percent of the flock is outside the ideal range, review the feeding program. 3. Provide shade and shelter for sheep to reduce heat or cold stress. Water availability must be uninterrupted. 4. For housed sheep, ensure adequate feeder space. At least 30 cm of feed bunk space per ewe is recommended to prevent competition. ### Worker Safety During Feed Handling Feeding operations involve several safety risks. Heavy bales, feed bags, and grain handling can cause musculoskeletal injuries. Dust from feed and hay can irritate respiratory passages. Molds produce mycotoxins that are hazardous to inhale. Silo gases are fatal in enclosed spaces. [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) safety resources emphasize the importance of proper lifting techniques, use of mechanical equipment, and dust masks when handling dusty feed. For silage, workers must never enter a silo without proper ventilation and a safety harness. If a worker feels dizzy or nauseous near a silo, they should leave immediately and seek fresh air. A decision path for worker safety: 1. Train all workers in safe lifting and equipment operation. 2. Wear gloves and dust masks when handling moldy feed, hay, or grain. 3. If mold is visible or a musty odor is present, consider testing for mycotoxins. Contaminated feed should not be fed to livestock. 4. Post warning signs near silos and confined spaces. 5. Have a first aid kit and emergency contact numbers available in the feed storage area. ### Food Safety Considerations For sheep raised for meat or milk, nutrition affects food safety. Residue from medications, mycotoxins, or heavy metals can enter the food chain. Withdrawal times for any medicated feed must be strictly followed. Feed that contains animal protein is not permitted for sheep in many regions due to transmissible spongiform encephalopathy (TSE) risk. [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) provide guidance on preventing TSE in feed. A decision path for food safety: 1. Keep all feed receipts and labels. Record the source and batch number of any purchased feed. 2. Do not use feed containing meat and bone meal or other mammalian protein for sheep. 3. Follow label instructions for any medicated feed. Observe withdrawal periods. Write down the date of last medication and calculate the withdrawal end date. 4. If a flock is exposed to potential contaminants, contact a veterinarian to assess risk and arrange testing before sending animals to slaughter. ### Records to Keep for Nutrition Management Documentation of feed purchases, forage tests, and feeding records supports both performance monitoring and food safety. Records should include: - Date and amount of each feed delivery - Forage test results for each batch - Ration formulation used for each group - Daily feed offered and refused (for confined groups) - Body condition scores at key points - Any changes to feeding due to weather, health, or pasture conditions - Water quality test results The National Animal Health Monitoring System [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) underscores that farms with detailed feed records can more quickly identify causes of poor performance. For example, if lamb growth declines, feed records can show whether a new batch of grain was introduced that may have lower energy content. ### Escalation to Professionals Nutrition problems often require expertise beyond the farm manager. The appropriate professional depends on the issue. | Problem | Contact | Reason | | --- | --- | --- | | Forage analysis shows low protein or high fiber | Nutritionist or extension specialist | To formulate a balanced supplement | | Suspected mineral deficiency or toxicity | Veterinarian and diagnostic laboratory | To confirm with blood or tissue tests | | Metabolic disease (pregnancy toxemia, hypocalcemia) | Veterinarian immediately | Emergency treatment needed | | Mycotoxin contamination in feed | Feed company representative and laboratory | To test and determine safe disposal | | Poor lamb growth without obvious disease | Nutritionist | To review ration and feeding management | | Water quality issues | Water engineer or extension specialist | To test and recommend treatment | | Unexplained poor performance in multiple groups | Veterinarian and nutritionist | To investigate combined causes | If a problem affects more than 5 percent of a group, contact a veterinarian. For ongoing nutritional planning, a nutritionist should review the program at least once per year or when changing feed sources. ### Uncertainty in Nutrition Management Nutrition science provides general guidelines, but actual requirements vary with genetics, environment, and individual animal variation. Feed analysis is an estimate, not a guarantee. Ruminal digestion is complex and not perfectly predictable. The best approach is to monitor performance and adjust accordingly. There is no substitute for close observation of body condition, growth rates, and manure consistency. When in doubt, consult a professional. ### Performance Records for Nutrition To evaluate the feeding program, track these performance indicators: - Average daily weight gain of lambs from birth to weaning - Lamb weaning weight at a standard age (e.g., 60 days) - Ewe body condition change from breeding to lambing - Incidence of metabolic diseases (number of cases per year) - Lamb mortality within the first 72 hours of life Compare these indicators to target ranges established with a veterinarian or nutritionist. If deviations occur, review the feeding records and adjust the ration or management. ### Environment and Nutrition Feeding management interacts with the environment in several ways. Manure from fed sheep contains nitrogen and phosphorus that can run off into waterways if not managed. Overfeeding concentrates leads to higher nutrient excretion. Pasture management with rotational grazing reduces nutrient buildup and improves soil health. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) and [FAO animal production](https://www.fao.org/animal-production/en/) resources encourage practices that minimize the environmental footprint of [livestock farming](/knowledge/animal-farming/farm-management/livestock-farming-an-overview-of-modern-practices-and-challenges). A decision path for environmental management: 1. Avoid feeding in sensitive riparian areas. Use portable feed troughs that can be moved regularly. 2. Confine feeding to well drained areas to reduce mud and manure accumulation. 3. Test soil where feed is stored and fed regularly to monitor nutrient loading. 4. If manure accumulates, develop a plan for composting or spreading on cropland at agronomic rates. ### Conclusion of Nutrition Section Feeding a sheep flock is a dynamic process that requires knowledge of nutrient requirements, feed quality, and animal monitoring. A systematic approach with regular feed testing, body condition scoring, and record keeping reduces the risk of nutritional disease and supports efficient production. When performance falters, consult a veterinarian or nutritionist. The references provided in this section, including the [FAO animal production](https://www.fao.org/animal-production/en/), [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/), [Merck Veterinary Manual](https://www.merckvetmanual.com/), and [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) offer additional detailed guidance. The feeding program is not static. It must adapt to the flock's changing needs and the farm's available resources. With careful management, nutrition becomes a tool for enhancing welfare, productivity, and the long term sustainability of the sheep enterprise. ## Lambing: Managing the Lambing Season for Flock Health and Productivity Lambing is the most intense and high risk period in a sheep farming year. A well managed lambing season reduces lamb mortality, protects ewe welfare, and sets the foundation for the flock’s future productivity. This section covers preparation, recognition of normal and abnormal labor, immediate care of ewes and lambs, biosecurity, worker safety, and sustainability. All recommendations are educational and do not replace professional veterinary advice. When doubt arises, consult a veterinarian promptly. ### Pre Lambing Preparation: Nutrition and Facilities The final trimester of pregnancy is the most nutritionally demanding for a ewe. Flock health observation during the last four to six weeks before lambing focuses on body condition, udder development, and signs of metabolic disorders such as pregnancy toxemia. Live lambing weight and colostrum quality depend on adequate energy and protein intake during this period. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) emphasizes that underfeeding in late gestation reduces birth weight, lamb vigor, and colostrum production. Overfeeding fat ewes increases the risk of dystocia and metabolic disease. #### Records to Keep | Record | Purpose | Frequency | |--------|---------|-----------| | Ewe body condition score | Identify thin or fat ewes | Monthly, last 6 weeks pre lambing | | Expected lambing date | Plan pen allocation, staff | At breeding | | Feed intake and type | Adjust ration, detect anorexia | Daily in late gestation | | Lamb birth weight | Monitor ewe nutrition, genetics | At each lambing | | Colostrum quality (if tested) | Assess passive immunity transfer | Random samples | #### Decision Path for Pre Lambing Housing 1. Evaluate weather forecast. For temperate climates with low wind and dry bedding, outdoor lambing on pasture may be acceptable. For cold, wet, or muddy conditions, indoor lambing pens reduce hypothermia and infection. 2. Clean and disinfect lambing pens at least two weeks before the first expected lamb. For an indoor system, provide 1.5 to 2.5 square meters per ewe with clean straw bedding. Remove all old manure. 3. Group ewes by due date. Move ewes to the lambing area within 24 to 48 hours of expected lambing. Moving earlier can increase stress and risk of abortion. 4. Ensure easy access to clean water and feed. Rations should include a high quality forage and a grain concentrate to meet energy demands. The [FAO animal production](https://www.fao.org/animal-production/en/) resources advise that water consumption increases by 50 percent in the last month of pregnancy. #### Uncertainty in Pre Lambing Nutrition Individual ewe requirements vary with litter size, body condition, and health status. Ultrasound scanning for litter size at 50 to 90 days of gestation allows targeted feeding. Ewes carrying triplets need 20 to 30 percent more energy than ewes with singles. If scanning is not available, feed to condition score at 3.0 to 3.5. Overfeeding a ewe with a small litter can lead to obesity and lambing difficulty. Underfeeding a ewe with a large litter can cause pregnancy toxemia. When in doubt, test forage for protein and energy content and consult a nutritionist. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources note that pregnancy toxemia is a common cause of ewe death in late gestation. ### Recognizing the Stages of Labor Observation without unnecessary disturbance is critical. Sheep labor divides into three stages. **Stage 1** (2 to 6 hours): The ewe becomes restless, isolates from the flock, may paw the ground, and appears uncomfortable. The cervix dilates. This stage is often overlooked. A ewe that stands repeatedly then lies down and gets up is likely in early labor. Do not intervene. Provide a quiet environment. **Stage 2** (30 minutes to 2 hours): Active straining begins. The water bag appears at the vulva, usually followed by the lamb’s front feet and nose. A normal presentation is two front feet with the head resting on the knees. The ewe pushes and the lamb should be delivered within 30 to 60 minutes after the water bag is visible. If no progress is made in 30 minutes of active straining, intervention is indicated. **Stage 3** (1 to 6 hours after lambing): The placenta is expelled. Retained placenta beyond 6 hours should prompt veterinary consultation. #### Health Observation During Lambing - Note the ewe’s respiration, effort, and color of mucous membranes. - Check the lamb’s presentation as soon as feet appear. Two feet and a head. If only one foot or the head is not visible, reposition if necessary. - Record lambing ease: unassisted, minor pull, major pull, or caesarean. This information feeds into genetic selection for easier lambing. - Observe for excessive bleeding. A small amount of blood is normal, but continuous flow or a blood soaked bedding indicates possible uterine laceration or rupture. ### Normal Lambing and Immediate Lamb Care Most ewes lamb without assistance. Unnecessary interference disrupts the ewe lamb bond and increases stress. Watch from a distance. Once the lamb is born, the ewe should immediately clean the lamb. The licking process stimulates the lamb and helps dry it. #### Colostrum Management Colostrum is the single most important factor for lamb survival. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) states that lambs must consume colostrum within the first 4 to 6 hours of life to achieve adequate passive immunity. Ewes that have not been vaccinated against clostridial diseases should be vaccinated during late pregnancy to ensure high antibody levels in colostrum. **Colostrum sources**: - Ewe’s own colostrum is best. - Frozen colostrum from a healthy ewe on the same farm can be used. Thaw slowly at 37°C (not in a microwave). - Commercial colostrum replacers are available but have lower immunoglobulin concentrations. - If a ewe dies or is unable to nurse, offer colostrum via bottle or stomach tube within 2 hours. **Quantity**: A 4 kg lamb needs approximately 200 ml of colostrum in the first 6 hours, and a total of 400 ml by 24 hours. Overfeeding can cause aspiration, so use a tube if the lamb is weak. #### Drying and Warming Hypothermia is a leading cause of lamb death, especially in cold or wet weather. In cold conditions, dry the lamb with a towel and place it under a heat lamp (with caution to avoid fire hazard) or in a warm box for 15 minutes before returning to the ewe. When the lamb is warm and dry, it will search for the udder. #### Welfare Considerations During Assistance - Use clean, lubricated hands or sleeves when assisting. - Never pull on a lamb unless the presentation is correct. Forceful pulling can damage the ewe’s pelvis or cause injury to the lamb. - If the ewe becomes exhausted, stop and call a veterinarian. - Provide pain relief to a ewe after a difficult lambing. [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) recommend using analgesics under veterinary guidance. #### Food Safety If a ewe requires antibiotic treatment after lambing, follow withdrawal times. Milk from treated ewes must not be used for human consumption or for feeding orphan lambs if the product label prohibits it. Record all treatments. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources highlight that antibiotic residues in [sheep products](/knowledge/animal-farming/sheep/sheep-products-meat-wool-and-milk-marketing) can be avoided by adhering to label instructions and keeping clear records. ### Dystocia and Obstetric Manipulation Dystocia is the inability to give birth normally. Common causes: - Malpresentation (head back, breech, leg back, twins tangled) - Lamb too large for the ewe’s pelvis (common in single births) - Uterine inertia (exhaustion after a long labor) - Vaginal prolapse or cervical not fully dilated #### Decision Path for When to Intervene and When to Call a Veterinarian 1. **Observe**: If a ewe has been in active labor (stage 2) for 30 minutes without producing a lamb, approach quietly and examine. 2. **Examine**: Clean the perineum with warm water and disinfectant. Use a clean obstetric glove and lubricant. Palpate to determine presentation. - If two front feet and a head are present, apply gentle traction downward toward the ewe’s hocks. - If the head is not present but the feet are, push the lamb back gently and correct the head position. Pull steady only during contractions. - If the head is present but one leg is back, the lamb is stuck. Push the head back slightly, bring the trapped foot forward, then pull. - If the lamb is breech (tail first, hind legs extended or flexed), it is very difficult. Attempt to push the lamb back and bring the hind legs out. If this fails, call a veterinarian. 3. **Veterinary escalation**: Call a veterinarian immediately if - You cannot correct malpresentation after two attempts. - The lamb is too large to pass through the pelvis. - The ewe shows signs of exhaustion, severe pain, or shock. - The cervix is not fully dilated (you cannot feel the lamb at the cervical opening). - There is evidence of uterine torsion or rupture (bloody discharge, severe straining without progress). - The ewe has a vaginal prolapse that cannot be reduced. 4. **Caesarean section**: If the lamb is alive and cannot be delivered vaginally, a veterinarian may perform a C section. This is a major surgery but can save both ewe and lamb if performed early. #### Worker Safety During Obstetric Assistance - Wear clean gloves to prevent zoonotic infections (Q fever, chlamydia). [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) note that Chlamydia abortus can cause abortion in sheep and is zoonotic. - Use caution around the ewe’s hind legs, a startled ewe can kick forcefully. - Work in a well lit area with a clean floor to avoid slips. - Keep a halter or head gate to restrain the ewe if needed. #### Records to Keep - Date and time of assistance. - Type of presentation. - Duration of manual assistance. - Outcome (live lamb, dead lamb, ewe survival). - Treatments administered (antibiotics, painkillers, hormones). - If caesarean, note surgeon and recovery. ### Post Lambing Care for Ewe and Lamb After lambing, monitor both ewe and lamb closely for the first 48 hours. #### Ewe - **Check for retained placenta**: If the placenta has not passed within 6 to 12 hours, consult a veterinarian. Retained placenta can lead to metritis. - **Inspect the udder**: Look for swelling, heat, or redness (mastitis). A ewe that rejects her lamb or walks with a stiff gait may have a sore udder. Isolate and treat. - **Vaginal discharge**: Some reddish discharge for a few days is normal. Foul smelling or purulent discharge indicates infection. - **Feed**: Offer fresh water and high quality hay. Gradually reintroduce grain. A ewe with milk fever (hypocalcemia) may stagger, collapse, or have bloat. This is an emergency. Administer calcium gluconate under veterinary direction. #### Lamb - **Navel care**: Dip the navel in 7 percent iodine tincture or a chlorhexidine solution within 20 minutes of birth. This reduces the risk of joint ill (arthritis) and navel ill. - **Identification**: Ear tags are placed within 24 hours. Ensure clean and correct placement to prevent infection. - **Castration and tail docking**: If these are performed, do so within the first week of life. Pain relief is recommended. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) suggests using rubber rings or surgically under local anesthetic. Tail docking has welfare implications, dock only to prevent flystrike and leave enough tail to cover the anus (tail length at least 2 cm). - **Weak lambs**: Provide stomach tube feeding of colostrum or milk replacer every 2 to 3 hours. Warm the lamb. If no improvement in 24 hours, assess for disease (joint ill, pneumonia, white muscle disease). Consult a veterinarian. #### Uncertainty in Post Lambing Decisions Not all lambs that are slow to stand need intervention. A healthy lamb may take 30 minutes to stand and 1 hour to nurse. If the lamb has not nursed by 2 hours, assist by placing it on the teat. For lambs that are cold or weak, rewarming and tube feeding often resolves the issue without antibiotics. However, if the lamb develops a fever, swollen joints, or respiratory distress, diagnostic workup is necessary. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) reports that lamb mortality surveys show 15 to 25 percent of lamb loss occurs in the first 3 days. Many of these deaths are preventable with good management. ### Lambing Season Biosecurity and Disease Prevention The lambing period is a high risk time for the introduction and spread of infectious diseases. Abortions caused by Chlamydia abortus, [Toxoplasma gondii](/knowledge/parasites/protozoa/toxoplasma-gondii-lifecycle-neurological-infection), Campylobacter fetus, Leptospira, and [Border disease virus](/knowledge/viruses/livestock-viruses/border-disease-virus) can wipe out a lamb crop. #### Biosecurity Practices - **Quarantine**: Newly purchased ewes or rams should be isolated for 30 days before entering the lambing area. Observe for signs of abortion or illness. - **Clean lambing pens**: Remove bedding after each lambing group. Disinfect with a broad spectrum disinfectant active against viruses and bacteria. Leave pens empty for 24 hours between groups. - **Separate sick ewes**: Any ewe that aborts or has a sick lamb should be moved to a separate isolation pen. Do not allow her to contaminate the main lambing area. - **Placenta disposal**: Remove and incinerate or deep bury placentas from aborted ewes. Do not leave them in the field where they can be ingested by scavengers or contaminate the ground. - **Feed hygiene**: Clean feeders regularly. Mouldy feed or mycotoxins can cause abortion. - **Vaccination**: Vaccinate ewes for enzootic abortion (EAE) and toxoplasmosis 4 to 6 weeks before breeding. Follow vaccine label instructions. #### Diagnostic Escalation for Abortion Storms If more than 2 percent of ewes abort within a 2 week period, consider it an abortion storm. Collect the following samples and send to a veterinary diagnostic laboratory: - Fetus and placenta (refrigerated, not frozen) - Paired blood samples from affected ewes (acute and convalescent) - Vaginal swabs from aborting ewes - Feed sample for mycotoxin analysis Contact your veterinarian and extension specialist immediately. The [FAO animal production](https://www.fao.org/animal-production/en/) resources provide guidance on sample submission protocols. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) include reporting requirements for certain abortive diseases. #### Worker Safety and Zoonotic Risks Certain abortive agents are transmissible to humans. Q fever (Coxiella burnetii) and Chlamydia abortus can cause flu like illness and miscarriage in pregnant women. Pregnant or immunocompromised people should avoid contact with lambing ewes and aborted material. Wear gloves, coveralls, and a mask when handling aborted tissues. Wash hands thoroughly after any contact. ### Common Lambing Emergencies Timely recognition and escalation are critical. The following emergencies require immediate veterinary attention unless the shepherd is trained and equipped to handle them. #### Vaginal and Uterine Prolapse Vaginal prolapse often occurs in late pregnancy. If caught early, the ewe can be placed on a slope (head down) and the prolapse cleaned, lubricated, and replaced. A harness or vaginal suture may be needed to hold it. If the uterus itself prolapses after lambing, it is a dire emergency. Keep the uterus moist and clean and call a veterinarian immediately. Do not try to replace a uterine prolapse unless you have been trained and have the necessary sedatives and pain medication. #### Pregnancy Toxemia Caused by negative energy balance in late pregnancy. Signs include depression, lack of appetite, stumbling, blindness, and eventually coma. Blood test for ketones (beta hydroxybutyrate) can confirm. Treatment involves oral or intravenous glucose and propylene glycol. Severe cases may require caesarean or induction of labor. Prevention through careful body condition management and feeding is essential. #### Hypocalcemia (Milk Fever) Occurs up to 2 weeks after lambing. The ewe is weak, uncoordinated, and may have bloat. Treatment is calcium borogluconate subcutaneously or intravenously given by a veterinarian. Response is usually rapid. #### Lamb Hypothermia Hypothermic lambs need to be warmed gradually. If internal body temperature is below 37°C, warm in a dry place with supplemental heat. If below 34°C, the lamb may need a warm water bath (38°C) until temperature rises, then dry thoroughly. Always provide glucose solution or colostrum after warming. #### Hemorrhage Severe bleeding from the vagina after lambing may indicate a uterine tear or arterial rupture. Apply direct pressure if possible and call a veterinarian. This is life threatening. ### Sustainability of Lambing Outcomes Reducing lamb mortality directly improves the sustainability of the flock. The [FAO animal production](https://www.fao.org/animal-production/en/) resources emphasize that improving lamb survival reduces the number of replacement ewes needed, lowering greenhouse gas emissions per kilogram of lamb produced. #### Strategies to Reduce Lamb Mortality - Avoid overconcentration of lambing pens. Crowding increases infection spread and lamb mismothering. - Provide shelter from wind and rain. - Ensure adequate supervision during peak lambing. - Cull ewes with poor mothering ability or repeated dystocia. - Use genetic selection indexes that include lambing ease and maternal ability. #### Environmental Considerations Outdoor lambing reduces the need for bedding and energy for lighting and heating. However, if the climate is severe, indoor lambing may reduce mortality enough that the overall carbon footprint is lower. Use renewable or low carbon energy sources for heat lamps. Manage lambing pen manure to minimize nitrogen runoff. Compost soiled bedding before field application. ### Worker Safety During Lambing Lambing season involves long hours, fatigue, and physical demands. Worker safety is a component of flock welfare because stressed workers are less likely to detect health problems. - Use mechanical lifting aids for heavy ewes. - Keep floors dry to prevent slips. - Maintain good lighting in lambing sheds. - Take regular breaks to avoid decision fatigue. - Use protective gear when handling placental tissues and aborted lambs. - Know the signs of zoonotic illness (fever, chills, flu like symptoms) and seek medical advice promptly. ### Food Safety Considerations Sheep products including milk and meat must be safe for human consumption. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources provide regulations regarding drug residues. - Do not use milk from ewes treated with antibiotics for human consumption until withdrawal periods are met. - If a ewe is culled due to chronic illness or severe dystocia, the carcass must be inspected for fitness for human consumption. - Record all treatments on the flock health record so that slaughtered animals can be withheld appropriately. - If an ewe dies unexpectedly, do not consume her meat. Submit to a diagnostic laboratory if the cause of death is unknown and may have food safety implications. ### Eight Frequently Asked Questions about Lambing **1. How long should I wait before assisting a ewe in labor?** If the ewe has been in active straining for more than 30 minutes without producing a lamb, or if the water bag breaks and no lamb appears within 15 to 20 minutes, examine the ewe. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) recommends intervention after 30 minutes of unproductive effort. **2. My ewe is not eating after lambing. Is that normal?** Some ewes are temporarily off feed, but if it persists beyond 6 hours, check for retained placenta, fever, or metabolic disease. Anorexia combined with weakness can be pregnancy toxemia. Contact a veterinarian. **3. How much colostrum should I feed a weak lamb?** Feed 50 ml per kg of lamb body weight every 2 hours for the first 12 hours. For a 4 kg lamb, that is 200 ml per feed. Use a stomach tube to avoid aspiration. **4. Can I use cow colostrum for lambs?** Cow colostrum is inferior in immunoglobulins for lambs, but if no ewe colostrum is available, it can be used as a short term supplement. It is better than nothing, but provide e ## Section 4: Managing Parasite Risk and Ensuring Flock Welfare Parasite management and welfare are closely linked. Internal and external parasites reduce feed conversion, lower immune response, and cause pain. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) notes that subclinical parasitism often goes undetected yet depresses flock productivity. This section covers parasite risk, health observation, biosecurity, diagnostic escalation, emergencies, and welfare. It also addresses sustainability and worker safety. ### H2: Health Observation as the First Line of Defence Daily observation is the foundation of parasite control. Look for signs of ill thrift, diarrhoea, pale mucous membranes, bottle jaw, or rough coat. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) reports that many sheep operations rely on visual appraisal to trigger faecal egg counts. Record your observations in a flock health record. **Records to keep for health observation:** | Observation | Frequency | What to note | |-------------|-----------|--------------| | Body condition score | Monthly (at least) | Score 1 to 5, aim for 2.5 to 3.5 depending on stage | | Faecal consistency | Weekly during high risk periods | Score 0 (firm) to 3 (watery) | | Mucous membrane colour | Monthly or at handling | Pale (anaemia) vs normal pink | | Coat condition | At each handling | Dull or broken fibres may indicate lice or mites | | Ewe udder and lamb navels | Daily during lambing | Swelling, discharge, redness | If you see a lamb with a wet tail or scouring, treat as a suspect for coccidiosis or nematodirus. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) emphasize that early detection reduces treatment costs and improves animal welfare. ### H3: Recognising Parasite Risk Periods Parasite burdens fluctuate with season, management, and weather. High risk periods include: - **Spring** when lambs begin grazing and grass grows rapidly. Nematodirus eggs hatch in synchrony with lamb age. - **Summer** when warm, moist conditions favour larval survival on pasture. [Haemonchus contortus](/knowledge/parasites/livestock-parasites/haemonchus-contortus) (barber’s pole worm) thrives. - **Autumn** when ewes carry a post lambing rise in egg output. Contamination of autumn pasture affects weaned lambs. Use local knowledge and extension advice. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources provide regional parasite alerts in some states. ### H3: Biosecurity to Prevent Parasite Introduction New sheep can introduce resistant worms or external parasites. Quarantine for at least 21 days. During quarantine: - Perform a faecal egg count and use a targeted treatment if counts are high. - Treat for lice and sheep scab (where present) with an appropriate ectoparasiticide. - Observe for signs of Oestrus ovis (nasal bot) or fly strike. - Only introduce sheep from flocks with known health status. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) provide guidance on movement certification. Keep separate clothing and boots for quarantine areas. Clean and disinfect handling facilities between groups. ### H2: Internal Parasite Control Internal parasites cause losses through reduced growth, anaemia, hypoproteinaemia, and death. The [FAO animal production](https://www.fao.org/animal-production/en/) resources highlight that an integrated approach reduces reliance on anthelmintics. #### H3: Faecal Egg Counts and Targeted Selective Treatment Faecal egg counting (FEC) is the standard diagnostic tool. Collect fresh dung from at least 10 animals per group. Use a McMaster or modified Wisconsin technique. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) advises that FEC results guide whether to treat. Record the results for each mob. **Decision path for targeted selective treatment in lambs:** 1. Take FEC from 10 to 15 lambs. 2. If mean FEC is below 200 eggs per gram, do not treat. Recheck in 14 to 21 days. 3. If mean FEC is 200 to 500 eggs per gram, weigh and condition score lambs. Treat only those with poor condition or scouring. 4. If mean FEC is above 500 eggs per gram, treat the whole mob with an appropriate anthelmintic. But also perform a faecal egg count reduction test (FECRT) after treatment to check for resistance. For ewes, treat at lambing if FEC is high or if body condition is low. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) notes that treating all ewes at lambing can accelerate resistance. #### H3: Anthelmintic Resistance and Rotation Resistance to benzimidazoles, levamisole, macrocyclic lactones, and monepantel is widespread in some regions. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) recommend performing a FECRT to confirm resistance. Do not rotate anthelmintics within a season, use one class per year based on sensitivity testing. **Records to keep for anthelmintic use:** - Date, product, batch number, dose rate, weight of animals treated. - Withdrawal period for meat and milk. - Results of FECRT (percentage reduction). If FECRT shows less than 95% reduction, the parasite population is resistant to that class. Escalate to a veterinarian or parasitologist to design a combination or salvage protocol. #### H3: Pasture Management for Parasite Control Grazing management reduces larval exposure. Key strategies: - Rotational grazing with rest periods of 21 days in warm weather, longer in cool weather. - Mixed or alternate grazing with cattle or horses. Cattle do not share sheep nematodes. - Hay or silage aftermath (low parasite risk). - Avoiding overstocking. The [FAO animal production](https://www.fao.org/animal-production/en/) suggests a stocking rate that allows at least 3 to 4 weeks of rest between grazings. Record pasture history: which species grazed, when, and any manure spreading. ### H2: External Parasite Control External parasites cause irritation, fleece damage, and secondary infections. #### H3: Lice and Keds Body lice (Bovicola ovis) cause rubbing and fleece loss. Sheep keds (Melophagus ovinus) suck blood and cause anaemia. Inspect by parting the wool on the neck, back, and flanks. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) recommends shearing as a non chemical control. Treat with a macrocyclic lactone injectable or pour on. Follow withdrawal periods. Record all treatments. #### H3: Fly Strike Fly strike (cutaneous myiasis) is an emergency. Lucilia cuprina or other blowflies lay eggs on soiled wool or wounds. Check sheep daily in warm, humid weather. Indicators: - Restlessness, foot stamping, tail flagging. - Dark wet patches on the fleece. - Foul smell. If you find fly strike, clip the wool around the maggots, apply a pyrethroid or organophosphate dressing, and provide supportive care. Isolate the affected sheep to prevent re infestation. **Emergency protocol for severe fly strike:** 1. Remove from flock immediately. 2. Clip wool, remove maggots manually with forceps. 3. Clean wound with dilute antiseptic. 4. Apply wound dressing and give pain relief (veterinarian prescribed). 5. Provide clean dry bedding and monitor for sepsis. If multiple sheep are affected, the case is a flock emergency. Escalate to a veterinarian to rule out underlying causes such as diarrhoea or poor dagging. ### H2: Welfare Assessment and Parasite Link Poor parasite control directly compromises welfare. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) define animal welfare as the state of the animal, including freedom from hunger, disease, and distress. A sheep with a high worm burden is in a negative welfare state. **Welfare indicators related to parasites:** - Body condition score below 2 (emaciation due to chronic parasitism). - Anaemia (FAMACHA score 4 or 5 for haemonchosis). - Diarrhoea with scalding of perineum (pain and discomfort). - Laboured breathing (lungworm infestations). - Fly strike (acute pain and stress). Record welfare assessments on the flock health record. If any animal scores poorly, implement a targeted treatment plan. If the problem persists despite treatment, escalate to a veterinarian and consider a diagnostic postmortem. ### H3: Worker Safety During Parasite Handling Parasite control involves handling chemicals and animals. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) resources remind producers to follow label instructions. - Wear gloves when handling anthelmintics, especially pour ons. - Use a dosing gun with a soft mouthpiece to avoid injury to the sheep. - Ensure ventilation in handling areas when using organophosphates or fly treatments. - Wash hands after contact with sheep and before eating. If a worker is accidentally splashed in the eye with a chemical, flush with water for 15 minutes and seek medical attention. ### H2: Diagnostic and Veterinary Escalation When routine parasite control fails, escalate to a veterinarian or diagnostic laboratory. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) notes that many producers delay diagnostics, leading to resistance development. **When to escalate:** - FECRT shows less than 90% reduction. - Multiple sheep show signs of ill thrift despite treatment. - Postmortem reveals high worm burdens in grazed sheep that were treated. - Unexplained sudden deaths in a group with suspected parasitism. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) recommends a full postmortem including worm counts from the gastrointestinal tract and lung. Submit fresh samples to a laboratory within 24 hours. **Records to send with a diagnostic submission:** - Flock history: age, breed, management. - Treatment records with dates and products. - FEC results from the group. - Clinical signs observed. - Number of animals affected and deaths. The laboratory will provide a parasitology report. Discuss results with a veterinarian to adjust the control program. ### H2: Emergencies Related to Parasites Some parasitic conditions become emergencies. #### H3: Acute Haemonchosis Haemonchus contortus causes sudden anaemia and death, especially in lambs. Signs: pale mucous membranes, bottle jaw, weakness. The [FAO animal production](https://www.fao.org/animal-production/en/) identifies this as a major constraint in warm climates. **Emergency response:** 1. Move affected sheep to a clean, low risk pasture or pen. 2. Treat with an effective anthelmintic (based on recent FECRT). 3. Give iron supplementation (done under veterinary advice). 4. Provide high protein feed to support recovery. 5. If bottle jaw is severe, a blood transfusion may be needed. Contact a veterinarian immediately. #### H3: Nematodirus Outbreak in Young Lambs Nematodirus battus causes profuse diarrhoea in lambs 6 to 12 weeks old. Outbreaks can kill 20% or more of the group if untreated. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) advises that treatment must be early. **Emergency signs:** - Lambs separate from mothers, huddled. - Scouring with brown watery faeces. - Dehydration and weakness. Treat all lambs in the group with a benzimidazole or levamisole. Move to clean pasture (one not grazed by lambs the previous spring). Provide electrolyte solution. If many are recumbent, call a veterinarian. ### H2: Sustainability in Parasite Control Sustainable parasite control reduces chemical use and preserves efficacy. The [FAO animal production](https://www.fao.org/animal-production/en/) advocates for anthelmintic stewardship. **Sustainability practices:** - Use targeted selective treatment (TST) based on FEC and condition. - Keep a proportion of the flock untreated to maintain refugia of susceptible worms. For example, leave 10 to 20% of adult ewes untreated if their FEC is low. - Incorporate genetic selection for resistance. Some breeds (e.g., St. Croix) show more resilience. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) programs support breeding for parasite resistance. - Use biological control with nematophagous fungi (Duddingtonia flagrans) where registered. - Practice rotational grazing and co grazing with cattle. Record the percentage of animals treated each season. Aim to reduce treatment frequency over time. ### H3: Worker Safety and Environmental Stewardship Anthelmintics can harm dung beetles and soil organisms. The [FAO animal production](https://www.fao.org/animal-production/en/) notes that avermectins persist in faeces. To minimise environmental impact: - Use shorter acting products when possible. - Do not treat when pasture is heavily contaminated with manure. - Collect and dispose of empty containers according to local regulations. If you suspect anthelmintic contamination of a watercourse, contact an environmental regulator. ### H2: Food Safety in Parasite Control Parasite treatments can leave residues. The [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) sets tolerances for drug residues in meat and milk. - Always record withdrawal periods for every product. - Withhold treated sheep from slaughter until the withdrawal period has ended. - If a ewe is culled after a recent anthelmintic treatment, verify that the withdrawal period is complete. - Do not use milk from ewes treated with macrocyclic lactones for human consumption if the withdrawal period has not been met. If an animal dies soon after treatment and is destined for the food chain, submit it to a diagnostic laboratory to rule out a toxic event that could affect food safety. ### H2: Welfare Assessment Beyond Parasites Parasites are only one part of welfare. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) include five freedoms. For sheep, assess: - Freedom from hunger and thirst: body condition, access to water. - Freedom from discomfort: bedding, shade, shelter from wind. - Freedom from pain, injury, disease: lameness, mastitis, parasitism. - Freedom to express normal behaviour: social grouping, grazing time. - Freedom from fear and distress: handling practices, transport. **Records to keep for welfare:** - Monthly body condition scores for a subset. - Lameness prevalence (record at each handling). - Mortality rates per season. - Causes of death (from postmortem). If lameness affects more than 5% of the flock, escalate to a veterinarian. Lameness reduces welfare and productivity. ### H3: Escalation for Welfare Concerns Welfare problems often require a veterinarian or extension specialist. - For chronic lameness: call a veterinarian to diagnose footrot or contagious ovine digital dermatitis. - For emaciation despite adequate feed: involve a nutritionist and a veterinarian to rule out Johnes disease, parasitism, or dental issues. - For unexplained high mortality: submit dead animals to a diagnostic laboratory and contact a veterinarian. The [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) conducts periodic studies on sheep health. Use their reports as benchmarks for your flock. ### H2: Eight Distinct Frequently Asked Questions about Parasite and Welfare **1. How often should I do a faecal egg count?** At least at lambing time (for ewes) and mid summer for lambs. More frequently if you suspect resistance or after a high risk period. The [Merck Veterinary Manual](https://www.merckvetmanual.com/) recommends at least twice a year for adult sheep. **2. Can I use a drench gun for ewes in late pregnancy?** Yes, but be gentle. Ewes in late pregnancy have compromised gut capacity. Drench slowly and avoid stress which can trigger pregnancy toxaemia. If a ewe is struggling, postpone treatment until after lambing if risk is low. **3. How do I know if my flock has resistant worms?** Perform a faecal egg count reduction test. Collect samples before treatment and again 10 to 14 days after treatment. If the reduction is less than 95%, resistance is present. Confirm with a laboratory. **4. What is the best time to treat for flies?** Treat when weather turns warm and humid. The [FAO animal production](https://www.fao.org/animal-production/en/) suggests preventive applications in late spring before the fly season peaks. Also dag sheep to reduce soiling. **5. Can I use garlic or diatomaceous earth for worm control?** The [Merck Veterinary Manual](https://www.merckvetmanual.com/) states that there is no peer reviewed evidence that these are effective against [internal parasites in sheep](/knowledge/parasites/livestock-parasites/internal-parasites-sheep-diagnosis-management). Use them only as a supplement, not as a primary control. **6. How do I check for lice without a vet?** Part the wool on the neck and back. Lice are small, pale brown insects moving among the wool fibres. If you see excessive rubbing or fleece damage, suspect lice. Treat with an appropriate product after confirming. **7. My lamb has a swollen lower jaw. Is it always bottle jaw?** Bottle jaw (submandibular oedema) is strongly associated with haemonchosis. But it can also occur with Johne’s disease or malnutrition. Check the FAMACHA score and perform a faecal egg count. If the lamb is anaemic, treat for haemonchosis. If not, have a veterinarian examine for other causes. **8. What is the welfare concern with moving sheep in hot weather?** Heat stress causes panting, collapse, and death. The [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) advise moving sheep in the cooler parts of the day, providing water during long moves, and avoiding crowding. Welfare is compromised if sheep cannot thermoregulate. ## Related Clinical & Scientific Guides * [Sheep Grazing Lease: Terms, Rates, and Legal Considerations](/knowledge/animal-farming/sheep/sheep-grazing-lease-terms-rates-and-legal-considerations) * [Sheep Breed Selection for Meat, Wool, Dairy, and Low-Input Systems](/knowledge/animal-farming/sheep/sheep-breed-selection-for-meat-wool-dairy-and-low-input-systems) * [Sheep Barn Flooring for Hoof Health: Best Materials and Practices](/knowledge/animal-farming/sheep/sheep-barn-flooring-hoof-health-materials-practices) ## References and Further Reading - FAO. Animal Production and Health. [FAO animal production](https://www.fao.org/animal-production/en/) - WOAH. Terrestrial Animal Health Code. [WOAH terrestrial standards](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/) - USDA APHIS. Livestock and Poultry Disease. [USDA APHIS animal health](https://www.aphis.usda.gov/livestock-poultry-disease) - Merck Veterinary Manual. [Merck Veterinary Manual](https://www.merckvetmanual.com/) - USDA APHIS. National Animal Health Monitoring System. [USDA National Animal Health Monitoring System](https://www.aphis.usda.gov/livestock-poultry-disease/nahms) ### H2: Related Farming Links - Sheep Nutrition Essentials - Grazing Systems for Sheep - Lambing Management Guide - Parasite Control in Sheep - Sheep Welfare and Handling ### H2: Educational Notice This section is for educational purposes only. It does not replace professional diagnosis, treatment, or advice. Always consult a licensed veterinarian for specific animal health issues. The author and publisher are not liable for any loss or damage arising from use of this information. Management decisions should be tailored to your local conditions, regulations, and veterinary guidance. ## Related Farming Guides - [Related farming guide](/knowledge/animal-farming/sheep/starting-a-sheep-farm) - [Related farming guide](/knowledge/animal-farming/sheep/pasture-management-for-sheep) - [Related farming guide](/knowledge/animal-farming/sheep/lambing-preparation-checklist) - [Related farming guide](/knowledge/animal-farming/sheep/sheep-farm-biosecurity-plan) - [Farm biosecurity planning](/knowledge/animal-farming/farm-management/how-to-write-a-farm-biosecurity-plan) - [Veterinary diagnostics library](/knowledge/diagnostics)