# Pasture [Pig Farming](/knowledge/animal-farming/swine/pig-farming-breeding-farrowing-nursery-grow-finish-nutrition-and-biosecurity): Breeds, Setup, and Rotational Grazing ## Key Takeaways - Breed selection for pasture systems prioritizes hardiness, foraging ability, and maternal traits, with heritage breeds like Tamworth and Berkshire often favored; performance metrics such as average daily gain and feed conversion ratio should be monitored, with deviations below breed standards triggering evaluation of feed and parasite control. - Rotational grazing is critical for parasite management and pasture health, requiring a minimum rest period of 21 days for cool-season grasses to break parasite life cycles and allow forage recovery to 6-8 inches. - Stocking density must be adjusted based on soil type, forage quality, and season, typically ranging from 4-12 growing-finishing pigs per acre, with monitoring of pasture condition score and rooting depth to prevent overgrazing exceeding 30% bare soil. - Shelter infrastructure, including portable huts or hoop structures with adequate bedding, is essential for mitigating heat and cold stress, with daily checks for condition, depth, and ventilation being paramount. - Health management necessitates vigilance against parasites and predators, with fecal egg counts exceeding 500 eggs per gram indicating a need for veterinary consultation and deworming protocols. - Food safety considerations for pasture-raised pigs include potential exposure to *Toxoplasma gondii* and *Trichinella*, necessitating strict biosecurity, rodent control, and avoidance of carcass access. --- Pasture pig farming integrates swine production with managed grazing systems where pigs are raised outdoors on pasture with access to shelter, forage, and rotational paddocks. This approach requires deliberate breed selection, fencing and shelter infrastructure, grazing management, and stocking density planning. The following content covers breed characteristics for pasture systems, pasture setup including fencing and water, rotational grazing principles, shelter options, and stocking density considerations. Practical management decisions, recordkeeping, welfare observations, and limitations are addressed throughout. ## At a Glance | Management Area | Key Decision | Typical Observation or Record | Limitation or Escalation Criterion | |-----------------|--------------|-------------------------------|------------------------------------| | Breed selection | Choose breeds with foraging ability, hardiness, and maternal traits | Record feed conversion, growth rate, and pasture utilization per breed group | If average daily gain falls below expected breed standard for two consecutive weeks, evaluate feed ration and parasite burden | | Stocking density | Determine pigs per acre based on soil type, forage quality, and rotation frequency | Monitor pasture condition score and rooting depth weekly | If bare soil exceeds 30% of paddock area before planned move, reduce stocking density or shorten grazing period | | Rotational grazing | Move pigs to fresh paddock based on forage height and soil condition | Record grazing days per paddock and rest period length | If rest period is less than 21 days for cool-season grasses, extend rotation to prevent overgrazing and parasite buildup | | Shelter | Provide portable huts or A-frames with bedding for all age groups | Check shelter condition, bedding depth, and ventilation daily | If pigs show signs of heat stress (panting, huddling) or cold stress (shivering, piling), adjust shelter design or bedding | ## Breed Selection for Pasture Systems Breed choice directly affects pig performance, foraging behavior, and management requirements in pasture systems. Hardiness, mothering ability, growth rate, and carcass quality are primary selection criteria. ### Hardiness and Foraging Ability Breeds that originated in outdoor or extensive systems typically exhibit greater foraging behavior, disease resistance, and tolerance to temperature fluctuations. Traditional or heritage breeds such as Tamworth, Berkshire, Large Black, and Gloucestershire Old Spots are commonly used in pasture systems. These breeds demonstrate active rooting behavior, which can improve soil aeration but also increase pasture damage if stocking density is not managed. Crossbreeding with modern commercial lines can balance hardiness with growth efficiency and carcass uniformity. ### Maternal Traits for Outdoor Farrowing Sows in pasture systems must have strong maternal instincts, good nest-building behavior, and the ability to farrow outdoors without intensive intervention. Breeds with docile temperaments and low stress responses are preferred for outdoor farrowing. Record farrowing ease, piglet survival rates, and sow body condition at weaning. If piglet mortality exceeds 15% in outdoor farrowing paddocks, evaluate shelter design, bedding depth, and predator presence. ### Growth Rate and Feed Conversion Pasture-raised pigs typically have lower average daily gain and higher feed conversion ratios compared to confined pigs due to increased energy expenditure for foraging and thermoregulation. Research trends in [outdoor pig production](/knowledge/animal-farming/swine/outdoor-pig-production-systems-management-welfare-and-economics) indicate that breed, nutrition, and management all influence growth performance (Research trends in outdoor pig production - A review, Asian-Australasian journal of animal sciences, 2017, PubMed). Record individual or group weights at weaning, mid-grower, and finishing stages. If growth rates fall below 0.5 kg per day for growing pigs, assess feed quality, parasite burden, and pasture availability. ## Pasture Setup and Infrastructure Proper pasture setup establishes the foundation for pig health, welfare, and productivity. Fencing, water systems, and laneways must be designed for rotational grazing. ### Fencing Options Permanent perimeter fencing should be constructed with woven wire or high-tensile electric fence to contain pigs and exclude predators. Interior paddock divisions can use portable electric netting or polywire with step-in posts. Electric fencing requires a charger with sufficient joule output to maintain voltage above 4,000 volts under load. Test fence voltage daily and record readings. If pigs escape or fence voltage drops below 3,000 volts, inspect for vegetation contact, broken wires, or charger malfunction. ### Water Systems Pigs require constant access to clean, fresh water. In pasture systems, water can be supplied through portable water tanks, automatic waterers, or nipple drinkers mounted on mobile units. Water consumption varies with temperature, pig size, and feed type. Record daily water intake per group if possible. If water consumption drops by more than 20% from the previous week, check for water quality issues, equipment failure, or illness. ### Laneways and Gates Laneways connect paddocks and allow pig movement without stress. Lane width should accommodate the largest equipment used for feeding or bedding delivery. Gates should be positioned to minimize mud accumulation and allow easy access for inspection. If laneways become excessively muddy or eroded, install geotextile fabric or gravel to improve drainage. ## Rotational Grazing Management Rotational grazing involves moving pigs through a series of paddocks to allow forage recovery, break parasite cycles, and distribute manure evenly. ### Grazing Period and Rest Period The length of time pigs occupy a paddock depends on forage type, stocking density, and season. For cool-season grass-legume mixtures, a grazing period of 3 to 7 days is typical, followed by a rest period of 21 to 45 days. Record the start and end dates for each paddock grazing event. If forage does not recover to 6 to 8 inches before the next grazing, extend the rest period or reduce stocking density. ### Parasite Management Continuous pasture use increases the risk of internal parasite transmission. Research on transmission dynamics of helminth parasites in pigs on continuous pasture shows that [Oesophagostomum dentatum](/knowledge/parasites/livestock-parasites/oesophagostomum-dentatum-swine-nodular-worm-intestines) and Hyostrongylus rubidus can accumulate when pigs are kept on the same ground without rotation (Transmission dynamics of helminth parasites of pigs on continuous pasture: Oesophagostomum dentatum and Hyostrongylus rubidus, International Journal for Parasitology, 1997, Elsevier). Rotational grazing with adequate rest periods helps break parasite life cycles. Fecal egg counts should be monitored at least twice per year, or more frequently if pigs show signs of poor growth, rough hair coats, or diarrhea. If fecal egg counts exceed 500 eggs per gram, consult a veterinarian for deworming protocol recommendations. ### Manure Distribution and Soil Fertility Pigs concentrate manure in areas where they feed, rest, and drink. Rotational grazing spreads manure more evenly across the pasture, reducing nutrient hotspots. Soil testing should be conducted annually to monitor phosphorus, potassium, and organic matter levels. Research on organic matter and physical attributes of an oxisol after swine waste application in perennial pastures indicates that swine manure can improve soil organic matter when applied at appropriate rates (Organic matter and physical attributes of an oxisol after swine waste application in perennial pastures, Revista Brasileira De Engenharia Agricola E Ambiental, 2014, Elsevier). If soil phosphorus exceeds agronomic recommendations, reduce stocking density or move feeding areas to prevent nutrient buildup. ## Shelter Options Pasture pigs require shelter from sun, wind, rain, and extreme temperatures. Shelter design affects pig comfort, health, and behavior. ### Portable Huts and A-Frames Portable huts made of wood or metal with insulated roofs provide shade and protection. A-frames are lightweight and can be moved with a tractor or ATV. Floor space should allow all pigs to lie down simultaneously without crowding. For growing pigs, provide 8 to 10 square feet per pig. For sows, provide 20 to 25 square feet per sow. Bedding such as straw or wood shavings should be added during cold weather and changed when soiled. ### Hoop Structures and Tunnels Larger hoop structures or polytunnel shelters can house multiple groups of pigs and provide more space for feeding and resting. These structures require anchoring against wind and regular cleaning to prevent ammonia buildup. If pigs show respiratory signs such as coughing or sneezing, evaluate ventilation and bedding moisture. ### Shade and Wallows In hot climates, pigs need access to shade and wallows for thermoregulation. Wallows can be constructed as shallow mud pits or lined with concrete to prevent erosion. Provide at least one wallow per 20 pigs. If pigs show signs of heat stress, such as excessive panting, drooling, or lying in urine, provide additional shade or misting systems. ## Stocking Density Stocking density determines pasture utilization, pig welfare, and environmental impact. The number of pigs per acre varies with soil type, forage productivity, and management intensity. ### Pigs Per Acre Guidelines Stocking density for pasture pigs typically ranges from 4 to 12 pigs per acre for growing-finishing pigs, depending on rotation frequency and forage quality. For farrowing sows, lower densities of 2 to 4 sows per acre are recommended to reduce piglet mortality and allow nest-building behavior. Record the number of pigs per paddock and the paddock area in acres. If pasture condition deteriorates or pigs show signs of overcrowding, such as increased aggression or poor body condition, reduce stocking density. ### Seasonal Adjustments Stocking density should be adjusted seasonally based on forage growth rates. During spring and fall when cool-season grasses grow actively, higher densities can be supported. During summer drought or winter dormancy, lower densities or supplemental feeding may be necessary. If forage height drops below 3 inches before the planned move, provide supplemental hay or grain to maintain pig condition. ### Soil and Vegetation Monitoring Monitor soil compaction, rooting depth, and vegetation cover after each grazing cycle. Pigs can cause significant soil disturbance through rooting, especially in wet conditions. If soil compaction or erosion is observed, extend rest periods, reduce stocking density, or move pigs to a sacrifice area during wet weather. ## Nutrition and Feeding Pasture provides forage, but pigs require supplemental feed to meet energy and protein requirements for growth and reproduction. ### Forage Contribution Pigs can consume significant amounts of pasture, particularly when forage quality is high. Legumes such as clover and alfalfa provide protein, while grasses provide energy. The contribution of pasture to total diet varies with breed, age, and forage availability. Record pasture quality through visual assessment or forage testing. If pigs lose body condition or growth slows, increase supplemental feed. ### Supplemental Feed Growing pigs on pasture typically receive a grain-based ration to meet energy demands. Research on two strategies for meeting energy demands of growing pigs at pasture indicates that feed intake and growth can be managed through ration formulation and feeding frequency (Two strategies for meeting energy demands of growing pigs at pasture, Livestock Production Science, 2003, Elsevier). Provide feed in troughs or on clean ground to reduce waste and parasite exposure. Record feed consumption per group daily. If feed intake drops by more than 15% for two consecutive days, check for feed spoilage, water availability, or illness. ### Mineral Supplementation Pasture-raised pigs may require additional minerals, particularly zinc, copper, and selenium. The history of zinc in agriculture shows that zinc is essential for growth, immune function, and skin health (History of zinc in agriculture, Advances in nutrition, 2012, PubMed). Provide a complete mineral supplement formulated for swine, or offer free-choice minerals in a covered feeder. If pigs show signs of mineral deficiency, such as poor hair coat, lameness, or reduced growth, consult a veterinarian or nutritionist. ## Health and Welfare Management Pasture systems present unique health challenges, including parasite exposure, predation risk, and environmental stress. ### Parasite Control Internal and external parasites are more common in pasture systems than in confinement. Fecal egg counts and clinical observation guide deworming decisions. Rotational grazing, pasture rest, and composting manure help reduce parasite loads. If pigs show signs of parasitism, such as poor growth, diarrhea, or anemia, collect fecal samples and consult a veterinarian. ### Predator Protection Predators such as coyotes, dogs, and birds of prey can attack pigs, especially piglets. Perimeter fencing should be predator-proof, with buried wire or electric strands to deter digging. Guardian animals such as livestock guardian dogs or donkeys may be used in some systems. If predator attacks occur, reinforce fencing and consider removing pigs to a safer area. ### Biosecurity Pasture pigs have more contact with wildlife and soil, increasing the risk of disease transmission. The USDA Animal and Plant Health Inspection Service provides swine disease surveillance and response information (USDA APHIS Swine Disease Information, www.aphis.usda.gov). Implement a biosecurity plan that includes quarantine for new animals, visitor protocols, and equipment disinfection. If pigs show signs of reportable disease, such as sudden death, fever, or neurological signs, contact a veterinarian and state animal health officials immediately. ### [Food Safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) Considerations Pasture-raised pigs may have higher exposure to food safety hazards such as [Toxoplasma gondii](/knowledge/parasites/protozoa/toxoplasma-gondii-lifecycle-neurological-infection) and Trichinella. Research indicates that pasture is a risk factor for Toxoplasma gondii infection in fattening pigs (Pasture is a risk factor for Toxoplasma gondii infection in fattening pigs, [Veterinary Parasitology](/knowledge/veterinary-medicine/veterinary-pathology-microbiology/parasite-host-interactions-immune-evasion-and-pathology), 2016, Elsevier). An epidemiological overview of swine trichinellosis highlights the importance of biosecurity and feed management (An epidemiological overview of swine trichinellosis in China, Veterinary Journal, 2011, PubMed). Implement rodent control, prevent access to carcasses, and follow good production practices. If pigs are intended for direct sale or processing, consult with a veterinarian about food safety testing and on-farm food safety plans. ## Records and Measurements Accurate records support management decisions and demonstrate compliance with certification programs. ### Essential Records Maintain records for each group of pigs, including: - Breed and source - Date of arrival or birth - Weaning weight and date - Feed consumption and type - Pasture paddock assignments and grazing dates - Health treatments and veterinary consultations - Mortality and culling reasons ### Pasture Condition Records Document pasture condition before and after grazing using a standardized scoring system. Record forage height, species composition, soil moisture, and rooting depth. If pasture condition declines over multiple rotations, adjust stocking density or rest period. ### Growth and Performance Records Weigh pigs at key stages: weaning, mid-grower, and finishing. Calculate average daily gain and [feed conversion ratio](/knowledge/animal-farming/poultry/feed-conversion-ratio-measuring-improving-poultry-efficiency). Compare performance to breed standards and previous groups. If performance declines, investigate feed quality, parasite burden, or environmental stressors. ## Common Failure Patterns Recognizing common problems allows early intervention. ### Overgrazing and Soil Erosion Overgrazing occurs when pigs are kept on a paddock too long or stocking density is too high. Signs include bare soil, erosion, and reduced forage recovery. If overgrazing is observed, reduce stocking density, shorten grazing periods, and extend rest periods. Consider using a sacrifice paddock during wet weather. ### Parasite Buildup Parasite buildup occurs when rest periods are too short or pigs are returned to the same paddock too frequently. Signs include poor growth, rough hair coat, and diarrhea. If parasite buildup is suspected, collect fecal samples and consult a veterinarian. Extend rest periods and consider using a different species for grazing rotation. ### Nutritional Deficiencies Nutritional deficiencies can occur when pasture quality is low or supplemental feed is inadequate. Signs include poor growth, reduced feed intake, and abnormal behavior. If deficiencies are suspected, test feed and pasture samples and consult a nutritionist. ### Heat Stress Heat stress occurs when pigs lack shade, water, or wallows during hot weather. Signs include panting, drooling, reduced feed intake, and huddling. If heat stress is observed, provide additional shade, misting, or wallows. Move pigs to a cooler paddock if possible. ## Welfare and Safety Context Pasture systems can provide high welfare standards when managed correctly, but they also present risks. ### Welfare Benefits Pasture pigs have more space, environmental enrichment, and natural behaviors such as rooting and foraging. Research on the gut microbiome and resistome of conventionally vs. pasture-raised pigs indicates that pasture systems may influence gut health and antimicrobial resistance (The gut microbiome and resistome of conventionally vs. pasture-raised pigs, Microbial genomics, 2023, PubMed). Provide rooting materials such as hay bales or compost to encourage natural behavior. ### Welfare Risks Welfare risks include exposure to extreme weather, predation, and disease. Monitor pigs daily for signs of illness, injury, or stress. If pigs show signs of poor welfare, such as lameness, emaciation, or aggression, intervene immediately and consult a veterinarian. ### Worker Safety Pasture systems require workers to handle pigs, operate equipment, and work in outdoor conditions. Provide training on [pig handling](/knowledge/animal-farming/swine/pig-handling-transport-welfare-best-practices), electric fence safety, and equipment operation. If workers are injured, provide first aid and review safety protocols. ## Professional Escalation Criteria Consult a veterinarian, nutritionist, or extension specialist when problems exceed on-farm expertise. ### Veterinary Consultation Consult a veterinarian if: - Mortality exceeds 5% in any group - Pigs show signs of reportable disease - Fecal egg counts exceed 500 eggs per gram - Pigs have persistent diarrhea, lameness, or respiratory signs - Parasite control is ineffective ### Nutritionist Consultation Consult a nutritionist if: - Average daily gain falls below 0.5 kg per day for growing pigs - Feed conversion ratio exceeds 4:1 - Pigs show signs of mineral deficiency - Pasture quality is poor or variable ### Extension Specialist Consultation Consult an extension specialist if: - Pasture condition declines despite management changes - Soil fertility or erosion problems persist - Stocking density recommendations are unclear - Certification or marketing requirements need clarification ## Frequently Asked Questions ### What are the best pig breeds for pasture systems? Breeds with strong foraging ability, hardiness, and good maternal traits are preferred for pasture systems. Tamworth, Berkshire, Large Black, and Gloucestershire Old Spots are commonly used heritage breeds. Crossbreeding with modern commercial lines can balance hardiness with growth efficiency. Record breed performance data to guide future selection. ### How many pigs per acre can I raise on pasture? Stocking density typically ranges from 4 to 12 growing-finishing pigs per acre, depending on rotation frequency, forage quality, and soil type. Farrowing sows require lower densities of 2 to 4 sows per acre. Adjust density based on pasture condition and pig performance. ### What type of fencing is best for pasture pigs? Permanent perimeter fencing should be woven wire or high-tensile electric fence. Interior paddock divisions can use portable electric netting or polywire with step-in posts. Maintain fence voltage above 4,000 volts under load. Test fence voltage daily and inspect for damage. ### How often should I move pigs to fresh pasture? Move pigs to fresh pasture every 3 to 7 days, depending on forage height, soil condition, and stocking density. Allow a rest period of 21 to 45 days for forage recovery and parasite break. Record grazing and rest periods for each paddock. ### What shelter do pasture pigs need? Pasture pigs need portable huts, A-frames, or hoop structures with bedding for protection from sun, wind, rain, and extreme temperatures. Provide 8 to 10 square feet per growing pig and 20 to 25 square feet per sow. Add bedding during cold weather and change when soiled. ### How do I manage parasites in pasture pigs? Rotational grazing with adequate rest periods helps break parasite cycles. Monitor fecal egg counts at least twice per year. If counts exceed 500 eggs per gram, consult a veterinarian for deworming recommendations. Prevent parasite buildup by avoiding continuous use of the same paddock. ### What are the main health risks for pasture pigs? Health risks include internal and external parasites, predation, heat stress, and exposure to wildlife diseases. Implement a biosecurity plan, monitor pigs daily, and consult a veterinarian for health problems. Provide shade, water, and wallows to reduce heat stress. ### Can pasture pigs be raised organically? Pasture pigs can be raised under organic certification programs that require access to pasture, organic feed, and no routine antibiotics or hormones. Check with your certifying agency for specific requirements. Maintain records of feed, health treatments, and pasture management. ## Related Farming Guides - [Swine Genetic Selection And Replacement Planning](/knowledge/animal-farming/swine/swine-genetic-selection-and-replacement-planning) - [Pig Farming Breeding Farrowing Nursery Grow Finish Nutrition And Biosecurity](/knowledge/animal-farming/swine/pig-farming-breeding-farrowing-nursery-grow-finish-nutrition-and-biosecurity) - [Pasture Management For Sheep](/knowledge/animal-farming/sheep/pasture-management-for-sheep) - [Catfish Farming Managing The Production Cycle From Stocking To Harvest](/knowledge/animal-farming/aquaculture/catfish-farming-managing-the-production-cycle-from-stocking-to-harvest) - [Manure Management For Pig Farms](/knowledge/animal-farming/swine/manure-management-for-pig-farms) ## Related Clinical & Scientific Guides * [Pig Enrichment Programs and Behavior Monitoring](/knowledge/animal-farming/swine/pig-enrichment-programs-and-behavior-monitoring) * [Swine Handling Facility Design for Safe Pig Movement](/knowledge/animal-farming/swine/swine-handling-facility-design-safe-pig-movement) * [Swine Feeding Management for Grow-Finish Pigs](/knowledge/animal-farming/swine/swine-feeding-management-for-grow-finish-pigs) ## References and Further Reading - [www.ars.usda.gov](https://www.ars.usda.gov/animal-production-and-protection) - [www.aphis.usda.gov](https://www.aphis.usda.gov/livestock-poultry-disease/swine) - [www.merckvetmanual.com](https://www.merckvetmanual.com/management-and-nutrition) - [Review: Precision Livestock Farming technologies in pasture-based livestock systems.](https://pubmed.ncbi.nlm.nih.gov/34953277). Animal : an international journal of animal bioscience, 2022. - [History of zinc in agriculture.](https://pubmed.ncbi.nlm.nih.gov/23153732). Advances in nutrition (Bethesda, Md.), 2012. - [Research trends in outdoor pig production - A review.](https://pubmed.ncbi.nlm.nih.gov/28728401). Asian-Australasian journal of animal sciences, 2017. - [The gut microbiome and resistome of conventionally vs. pasture-raised pigs.](https://pubmed.ncbi.nlm.nih.gov/37439777). Microbial genomics, 2023. - [An epidemiological overview of swine trichinellosis in China.](https://pubmed.ncbi.nlm.nih.gov/21296013). Veterinary journal (London, England : 1997), 2011. - [Sow housing associated with reproductive performance in breeding herds.](https://pubmed.ncbi.nlm.nih.gov/28594446). Molecular reproduction and development, 2017. - [Production Systems and Age Influence Fecal Mycobiota Diversity and Composition in Swine](https://doi.org/10.1007/s00248-025-02614-0). Microbial Ecology, 2025. - [Organic matter and physical attributes of an oxisol after swine waste application in perennial pastures](https://doi.org/10.1590/S1415-43662014000700008). Revista Brasileira De Engenharia Agricola E Ambiental, 2014. - [Finishing Cinta Senese pigs at pasture: Fatty acids composition of cured lard](https://api.elsevier.com/content/abstract/scopus_id/84861384966). Eaap Scientific Series, 2011. - [Two strategies for meeting energy demands of growing pigs at pasture](https://doi.org/10.1016/S0301-6226%2802%2900319-6). Livestock Production Science, 2003. - [Transmission dynamics of helminth parasites of pigs on continuous pasture: Oesophagostomum dentatum and Hyostrongylus rubidus](https://doi.org/10.1016/S0020-7519%2897%2900023-4). International Journal for Parasitology, 1997. - [Pasture is a risk factor for Toxoplasma gondii infection in fattening pigs](https://doi.org/10.1016/j.vetpar.2016.05.005). Veterinary Parasitology, 2016. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.