# Pig Farrowing Hut Design and Management for Outdoor Systems ## Key Takeaways - Hut design is critical for reducing preweaning mortality, with arc-style and blunt-top A huts demonstrating significantly lower mortality rates (3.8%) compared to inverted U huts (8.5%), primarily by creating safe piglet escape areas that mitigate crushing, which accounts for 93% of preweaning deaths. - Effective bedding management, including deep bedding (15-30 cm) for thermal insulation and absorbency, coupled with regular replacement of wet or soiled material, is essential for maintaining piglet body temperature and preventing respiratory issues linked to ammonia buildup. - Hut materials such as galvanized steel, polyethylene, and wood must be selected for durability against weather and sow activity, with floorless designs necessitating periodic rotation to prevent manure and nutrient accumulation, as evidenced by phosphorus accumulation patterns in soil. - Seasonal adjustments in bedding depth and ventilation are crucial; deeper bedding and draft-free conditions are needed in cold weather, while reduced bedding and increased air circulation, potentially with shade and wallows, are vital for managing heat stress in hot weather. - Biosecurity measures, including hut placement on well-drained ground, rotation between farrowing groups to break disease cycles, and strict visitor/equipment protocols, are paramount for preventing pathogen transmission and disease outbreaks. - Comprehensive record-keeping of farrowing events, piglet survival, mortality causes, and hut performance metrics is essential for identifying failure patterns, evaluating management effectiveness, and making data-driven decisions to optimize sow and litter productivity. --- Outdoor farrowing systems require hut designs that protect sows and piglets from weather, reduce preweaning mortality, and support efficient management. The farrowing hut is the primary structure that modifies the environment for the sow and litter, and selecting the right design directly affects piglet survival and sow welfare. This article covers hut materials, dimensions, bedding, and management practices for outdoor farrowing, drawing on published research and practical observations. ## At a Glance: [Outdoor Farrowing Hut](/knowledge/animal-farming/swine/outdoor-farrowing-huts-placement-management) Comparison | Hut Type | Key Design Features | Reported Preweaning Mortality | Safe Pig Area | |----------|---------------------|-------------------------------|---------------| | Arc-style hut | Curved roofline that slopes to ground, floorless | 3.8% (study average) | Sloping walls create protected zones along edges | | Blunt-top A hut | A-frame with guard rails, floorless | 3.8% (study average) | Guard rails prevent crushing along walls | | Inverted U hut | Vertical sides with arched top, floorless | 8.5% (study average) | Limited, fewer protected areas for piglets | A study evaluating five hut types over four years in Iowa found that arc-style and blunt-top A huts had about one-third as many litters with piglet mortalities and a lower preweaning mortality percentage (3.8 versus 8.5%) compared to an inverted U hut. This difference represented approximately half a pig per litter increase in litter size at weaning. Crushing of piglets accounted for 93% of preweaning mortality in that study. The superior huts each had a distinct and ample sow area and safe pig areas created by sloping or curved rooflines that came to the ground (arc-style) or by guard rails (blunt-top A hut). Selection of the outdoor farrowing hut is a critical decision in planning outdoor swine farrowing systems. ## Hut Materials and Construction ### Structural Materials [Outdoor farrowing huts](/knowledge/animal-farming/swine/outdoor-farrowing-huts-placement-management) must withstand weather, sow activity, and cleaning. Common materials include galvanized steel, polyethylene, and wood. Galvanized steel offers durability and resistance to corrosion but can conduct heat and cold. Polyethylene huts are lightweight and provide insulation but may degrade under prolonged sun exposure. Wood huts provide natural insulation but require treatment to resist moisture and chewing. The floorless design is standard for outdoor huts, allowing drainage and direct contact with the ground. This design requires the hut to be moved periodically to prevent manure buildup and soil nutrient accumulation. Research on spatial distribution of soil phosphorus fractions following one year of farrowing sows in an outdoor hog-rearing farm in Eastern Canada documented phosphorus accumulation patterns that inform hut rotation schedules. ### Dimensions and Layout Hut dimensions must accommodate the sow's lying area and provide separate zones for piglets. Typical dimensions for a single-sow farrowing hut range from 1.8 to 2.4 meters wide and 2.4 to 3.0 meters deep. The height should allow the sow to stand and lie down comfortably, usually 1.0 to 1.2 meters at the peak. The interior layout should create a distinct sow area and safe pig areas. The arc-style hut achieves this through a curved roofline that comes to the ground, creating protected zones along the edges where piglets can escape crushing. The blunt-top A hut uses guard rails mounted along the walls to create a gap between the wall and the sow, providing escape routes for piglets. These design features directly reduce crushing mortality. ### Flooring and Drainage Floorless huts rely on the ground surface for footing. The site should be well-drained to prevent mud accumulation inside the hut. A slight slope away from the hut entrance helps water run off. Bedding material provides insulation and absorbency. Concrete or gravel aprons at the hut entrance can reduce mud tracking and provide a firm surface for the sow to enter and exit. However, these surfaces require cleaning and may become slippery. The choice of flooring surface depends on soil type, rainfall, and management capacity. ## Bedding Management ### Bedding Materials Bedding provides thermal insulation, absorbency, and comfort for sows and piglets. Common bedding materials include straw, hay, wood shavings, and sawdust. Straw is preferred for its insulating properties and ability to absorb moisture. The bedding depth should be sufficient to create a dry, warm nest for piglets. Deep bedding (15 to 30 centimeters) helps piglets maintain body temperature, especially during cold weather. The bedding should be changed when it becomes wet or soiled to prevent ammonia buildup and respiratory issues. Air quality on swine farms has been linked with respiratory issues for both human and swine health, with the main cause being inhalation of small airborne particulate matter less than 10 micrometers in diameter. ### Seasonal Adjustments Bedding management changes with seasons. In cold weather, increase bedding depth and ensure the hut is draft-free. In hot weather, reduce bedding to allow air circulation and prevent overheating. Sows and piglets are susceptible to heat stress, and the protective role of wallowing against heat stress in gestating and lactating sows housed outdoors has been documented. During hot periods, provide shade over the hut and wallow areas. Research on effects of shaded versus unshaded wallows on behavior, performance, and physiology of the outdoor lactating sow showed that shade improves sow comfort and performance. ### Bedding Replacement Schedule Establish a regular bedding replacement schedule based on visual inspection. Remove wet or soiled bedding daily and add fresh material. Complete bedding changes should occur between farrowing groups to break disease cycles. The frequency of bedding changes depends on weather, sow density, and bedding material. Record bedding usage and replacement dates to track costs and identify patterns. High bedding consumption may indicate drainage problems or excessive moisture in the hut area. ## Sow and Piglet Management ### Pre-Farrowing Preparation Move sows to farrowing huts approximately 3 to 7 days before the expected farrowing date. This allows the sow to acclimate to the hut and establish a nest. Provide fresh bedding and ensure the hut is clean and dry. Monitor sows for signs of impending farrowing, including restlessness, nesting behavior, and milk letdown. Farrowing induction programs have been used to increase the proportion of sow farrowing during the work period and the rate of farrowing supervision. Induction should not be conducted more than 2 days earlier than the expected farrowing date to keep stillbirth rate and birth weight unaltered. ### Farrowing Supervision Supervision during farrowing reduces piglet mortality. Check sows frequently during the farrowing process, especially for first-parity sows. Assist with difficult farrowings only when necessary, following established protocols. Record farrowing start time, end time, number of piglets born alive, stillbirths, and mummies. This data helps identify sows with prolonged farrowing or high stillbirth rates that may require culling. ### Piglet Care Ensure piglets receive colostrum within the first few hours after birth. Colostrum provides antibodies and energy. Weak piglets may need assistance to nurse. Provide a warm, dry area for piglets to rest away from the sow. The safe pig areas created by hut design are critical for piglet survival. Guard rails or sloping walls allow piglets to escape if the sow lies down. Cross-fostering may be necessary to balance litter sizes. Move piglets within 24 hours of birth to ensure they receive adequate colostrum from their own dam. Record all cross-fostering activities. ### Weaning Weaning typically occurs at 3 to 4 weeks of age in outdoor systems. Remove the sow from the hut and leave piglets in the hut for several days to adjust. Provide creep feed starting at 10 to 14 days of age to prepare piglets for weaning. Record weaning weights, number weaned, and piglet condition. This data helps evaluate sow productivity and hut performance. ## Hut Climate and Ventilation ### Temperature Management Hut climate affects piglet survival and sow comfort. Research on whether hut climate matters for piglet survival in organic production indicates that temperature and humidity inside the hut influence mortality rates. A study comparing temperature and humidity in three types of outdoor farrowing huts found differences in internal climate that affect piglet survival. In cold weather, ensure the hut is draft-free but ventilated. Bedding provides insulation. In hot weather, provide shade and ventilation. Openings in the hut allow air movement but should not create drafts on piglets. ### Humidity Control High humidity inside the hut increases the risk of respiratory disease and reduces bedding effectiveness. Ensure adequate ventilation to remove moisture. Avoid placing huts in low-lying areas where moisture accumulates. Monitor humidity levels during wet weather. Increase bedding changes and ventilation as needed. Record humidity observations to identify problem periods. ### Ventilation Design Hut design should include ventilation openings that allow air exchange without creating drafts. The entrance opening provides primary ventilation. Additional openings in the back or sides can improve air movement. Adjust ventilation based on weather conditions. In cold weather, reduce openings to retain heat. In hot weather, maximize openings to promote air movement. The arc-style hut design naturally provides ventilation through the curved roofline. ## Biosecurity and Disease Prevention ### Hut Placement and Rotation Place huts on well-drained ground with good sun exposure. Rotate huts between farrowing groups to break disease cycles and prevent soil nutrient buildup. Research on effects of stocking rate and crude protein intake during gestation on ground cover, soil-nitrate concentration, and sow and litter performance in an outdoor swine production system provides guidance on appropriate stocking densities. The minimum rotation distance should be sufficient to prevent pathogen carryover between groups. Clean and disinfect huts between uses. Remove all bedding and manure before moving huts to new locations. ### Disease Monitoring Monitor sows and piglets for signs of disease daily. Common diseases in outdoor systems include respiratory infections, diarrhea, and parasitic infections. Record any health issues and treatments. [African swine fever](/knowledge/bioinformatics/african-swine-fever-computational-models-for-early-detection-and-spread-prediction-in-wild-boar-populations) is a highly contagious and lethal disease that can affect outdoor pig farms. Understanding transmission dynamics is crucial for effective response. After infection, farrowing sheds had a detection time of 8.0 days in median, compared to 9.8 days for fattening sheds. Early detection and reporting are essential for disease control. ### Visitor and Equipment Biosecurity Limit visitor access to farrowing areas. Provide clean boots and clothing for anyone entering the area. Disinfect equipment between uses. Establish a boot wash station at the entrance to the farrowing area. Use disinfectants effective against common swine pathogens. Record visitor access and biosecurity measures. ## Records and Measurements ### Essential Records Maintain records for each farrowing group and individual sow. Essential records include: - Sow identification and parity - Farrowing date and duration - Number of piglets born alive, stillbirths, mummies - Piglet birth weights - Preweaning mortality and causes - Weaning date and weights - Bedding usage and replacement dates - Health issues and treatments - Hut location and rotation schedule ### Performance Metrics Calculate key performance metrics to evaluate hut design and management: - Preweaning mortality percentage - Litter size at weaning - Average weaning weight - Sow farrowing interval - Stillbirth rate Compare metrics across hut types and seasons to identify best practices. The study comparing farrowing hut design and sow genotype effects on outdoor sow and litter productivity provides baseline data for evaluating hut performance. ### Record Analysis Review records regularly to identify trends and problems. High preweaning mortality may indicate hut design issues, bedding problems, or health issues. Low weaning weights may indicate inadequate nutrition or health problems. Use records to make management decisions, such as culling sows with poor performance, adjusting bedding practices, or changing hut types. Share records with veterinarians and advisors for professional input. ## Common Failure Patterns ### High Preweaning Mortality High preweaning mortality is the most common failure in outdoor farrowing systems. Crushing accounts for the majority of deaths. Hut design that lacks safe pig areas increases crushing risk. Other causes of preweaning mortality include starvation, diarrhea, and chilling. Ensure piglets have access to colostrum, a warm environment, and adequate nutrition. Address health issues promptly. ### Poor Sow Condition Sows in outdoor systems may lose condition during lactation if nutrition is inadequate. Provide adequate feed and water. Monitor sow body condition and adjust feed levels accordingly. Heat stress can reduce feed intake and milk production. Provide shade and wallows to help sows regulate body temperature. The protective role of wallowing against heat stress in gestating and lactating sows housed outdoors is well documented. ### Hut Damage Sows can damage huts through chewing, rubbing, and rooting. Inspect huts regularly for damage and repair promptly. Damaged huts may not provide adequate protection from weather or safe pig areas. Choose durable materials that resist damage. Galvanized steel and heavy-duty polyethylene are more resistant to damage than wood. ### Soil Nutrient Buildup Continuous use of the same hut location leads to soil nutrient buildup, particularly phosphorus. Research on spatial distribution of soil phosphorus fractions following one year of farrowing sows in an outdoor hog-rearing farm in Eastern Canada documented phosphorus accumulation patterns. Rotate hut locations to prevent nutrient buildup and environmental issues. ## Welfare and Safety Context ### Sow Welfare Outdoor farrowing systems provide sows with more space and natural behaviors compared to indoor crates. Sows can nest, root, and move freely. However, outdoor systems also expose sows to weather extremes and predation risks. The effect of farrowing environment and previous experience on the maternal behaviour of sows in indoor pens and outdoor huts has been studied. Sows with previous outdoor experience may adapt better to outdoor farrowing. Provide appropriate housing and management to support sow welfare. ### Piglet Welfare Piglet welfare depends on hut design, bedding, and management. Safe pig areas reduce crushing risk. Adequate bedding provides warmth and comfort. Proper nutrition and health care support piglet growth and survival. Monitor piglets daily for signs of illness, injury, or starvation. Intervene promptly when problems are identified. Record all welfare issues and interventions. ### Worker Safety Working with sows in outdoor huts carries risks of injury from sow aggression, lifting heavy materials, and exposure to weather. Use proper handling techniques and equipment. Provide training on safe sow handling and hut maintenance. Wear appropriate personal protective equipment, including boots, gloves, and hearing protection when using power tools. Maintain first aid supplies and emergency contact information. ### [Food Safety](/knowledge/bacteria/livestock-bacteria/cooking-chicken-bacteria-prevention) Outdoor farrowing systems must comply with food safety regulations. Maintain records of treatments and withdrawal periods. Prevent contamination of feed and water sources. Follow established protocols for medication use and withdrawal. Record all treatments and ensure proper withdrawal times are observed before slaughter. ## Professional Escalation Criteria ### When to Consult a Veterinarian Consult a veterinarian when: - Preweaning mortality exceeds 10% consistently - Sow mortality or morbidity increases - Disease outbreaks occur - Reproductive problems arise - Parasite burdens are high Veterinarians can provide diagnostic services, treatment protocols, and management advice. Establish a relationship with a veterinarian experienced in outdoor swine production. ### When to Consult an Extension Specialist Consult an extension specialist when: - Hut design changes are needed - Nutrient management plans are required - Environmental regulations affect operations - New technologies or practices are being considered Extension specialists can provide research-based information and technical assistance. Contact your local extension office for resources. ### When to Consult a Nutritionist Consult a nutritionist when: - Sow condition is poor - Piglet growth is inadequate - Feed costs are high - New feed ingredients are being considered Nutritionists can formulate diets specific to outdoor production systems. Provide feed intake and performance data for accurate recommendations. ## Decision Framework for Selecting and Evaluating Outdoor Farrowing Hut Systems Selecting the right farrowing hut design requires a structured evaluation of farm-specific conditions, management capacity, and performance goals. A systematic decision framework helps producers avoid costly mistakes and achieve target preweaning mortality rates below 5%, as demonstrated in studies of superior hut designs. This framework integrates hut type selection, site assessment, and ongoing performance evaluation into a repeatable process. ### Step 1: Assess Farm Conditions and Constraints Begin by documenting the physical and operational factors that influence hut performance. Record the following for each farrowing site: - Soil type and drainage characteristics. Well-drained sandy loam or gravel soils support floorless hut designs, while heavy clay soils require additional bedding and more frequent rotation to prevent mud accumulation inside the hut. - Typical seasonal temperature and rainfall patterns. Farms in regions with prolonged wet seasons may benefit from huts with raised floors or concrete aprons at the entrance to reduce moisture tracking. - Predator pressure. Areas with coyotes, foxes, or birds of prey may require huts with smaller entrances or additional fencing around the farrowing paddock. - Labor availability for daily monitoring and hut movement. Each additional hut type or location increases management complexity and time requirements. - Existing hut inventory and budget for new purchases. Retrofitting existing huts with guard rails or modifying ventilation openings may be more cost-effective than replacing entire structures. Document these factors in a written farm assessment that is reviewed annually or when adding new farrowing sites. The USDA Agricultural Research Service provides resources on [swine production systems](/knowledge/animal-farming/swine/swine-production-systems-comparing-conventional-organic-and-outdoor-models) that can inform site-specific recommendations. ### Step 2: Match Hut Type to Farm Conditions Use the assessment results to select a hut type that addresses the primary mortality risks on your farm. The study comparing five hut types over four years in Iowa found that arc-style huts and blunt-top A huts with guard rails reduced preweaning mortality to 3.8% compared to 8.5% for inverted U huts. This difference of approximately half a pig per litter represents a significant economic impact over multiple farrowing groups. Consider the following matching criteria: - For farms with heavy rainfall or wet soils: Arc-style huts with curved rooflines that shed water away from the entrance perform better than A-frame designs that may channel water into the hut opening. - For farms with high wind exposure: Blunt-top A huts with guard rails provide more stable structures that resist wind damage compared to lightweight polyethylene arc huts. - For farms with limited labor for hut modification: Arc-style huts require no additional guard rail installation, as the sloping walls naturally create safe pig areas along the edges. - For farms with large-framed sows: Ensure hut width and height accommodate the sow breed or genotype. Research on farrowing hut design and sow genotype effects on outdoor sow and litter productivity showed that sow size influences hut suitability and piglet survival. Create a written selection matrix that scores each hut type against your farm conditions. Update this matrix when new hut designs become available or when farm conditions change. ### Step 3: Establish Baseline Performance Targets Set measurable performance targets for each farrowing group based on published benchmarks and your farm history. Use the following targets as starting points: - Preweaning mortality: Less than 5% for superior hut designs, with a maximum acceptable threshold of 8% before intervention is required. - Litter size at weaning: At least 10 piglets per litter for multiparous sows in well-managed outdoor systems. - Average weaning weight: 6 to 7 kilograms at 3 to 4 weeks of age, depending on sow nutrition and litter size. - Hut occupancy rate: No more than one sow per hut, with huts cleaned and moved between farrowing groups. Record these targets in a written farrowing management plan. Compare actual performance to targets after each farrowing group and adjust management practices accordingly. ### Step 4: Implement a Monitoring and Record System Develop a standardized record system that captures the data needed to evaluate hut performance and identify problems early. Use a simple paper form or digital spreadsheet that includes the following fields for each farrowing event: - Sow identification number and parity - Hut type and identification number - Date moved into hut - Farrowing date and duration - Number of piglets born alive, stillbirths, and mummies - Piglet birth weights (weigh a sample of 5 to 10 piglets per litter) - Preweaning deaths by cause (crushing, starvation, diarrhea, other) - Weaning date and number weaned - Average weaning weight - Bedding type and amount used - Date hut was moved and new location Train all farm workers on consistent data collection procedures. Review records weekly during farrowing seasons and summarize results after each group is weaned. The USDA Animal and Plant Health Inspection Service provides guidance on [swine health monitoring](/knowledge/animal-farming/swine/swine-health-monitoring-disease-prevention-programs) that can be adapted for outdoor systems. ### Step 5: Conduct Regular Performance Reviews Schedule formal performance reviews after each farrowing group and at the end of each production year. During these reviews, calculate the following metrics and compare them to your baseline targets: - Preweaning mortality percentage: Total deaths divided by total born alive, multiplied by 100. - Crushing mortality percentage: Deaths from crushing divided by total deaths, multiplied by 100. - Litter size variation: Range and standard deviation of litter sizes at weaning across all sows. - Hut-specific mortality: Preweaning mortality percentage for each hut type or individual hut. Identify huts or hut types that consistently exceed the 8% mortality threshold. Investigate these cases by reviewing the record data and conducting a physical inspection of the hut. Common findings include: - Worn or damaged guard rails that no longer provide adequate piglet escape space - Bedding that is consistently wet due to poor drainage or inadequate ventilation - Huts placed in low-lying areas that accumulate moisture - Sow-specific factors such as poor maternal behavior or high parity Document the findings and corrective actions taken. Share results with farm workers and advisors to improve management practices. ### Step 6: Implement Corrective Actions and Escalate When Needed When performance reviews identify problems, implement corrective actions based on the likely cause. Use the following decision guide: - If crushing mortality exceeds 5%: Inspect safe pig areas for adequate size and function. Add guard rails to huts that lack them or modify existing rails to create a gap of 15 to 20 centimeters between the rail and the wall. Consider switching to arc-style huts if guard rails are ineffective. - If starvation mortality exceeds 2%: Evaluate sow nutrition and body condition. Ensure sows have access to adequate feed and water. Check piglet colostrum intake within the first 6 hours after birth. Consider cross-fostering weak piglets to sows with good milk production. - If diarrhea mortality exceeds 2%: Consult a veterinarian to identify the causative agent. Review biosecurity protocols and hut rotation schedules. Increase bedding changes and ventilation to reduce moisture and pathogen load. - If overall preweaning mortality exceeds 10% for two consecutive groups: Escalate to a veterinarian or extension specialist for a comprehensive evaluation of hut design, management practices, and herd health. Document all corrective actions and their outcomes. Use this information to refine your decision framework over time. ### Common Failure Patterns in Hut Selection and Management Producers commonly make the following errors when selecting and managing farrowing huts: - Choosing huts based on cost instead of performance. Inexpensive inverted U huts may save money upfront but result in higher preweaning mortality that reduces overall profitability. - Using the same hut type for all sows without considering individual sow size or behavior. Large sows may not fit comfortably in smaller huts, increasing the risk of crushing. - Failing to modify huts as sows age or as farm conditions change. Guard rails may need adjustment for different sow parities, and ventilation openings may need modification for different seasons. - Neglecting to rotate huts between farrowing groups. Continuous use of the same location leads to soil nutrient buildup and increased disease pressure, as documented in research on spatial distribution of soil phosphorus fractions following one year of farrowing sows. - Inconsistent record keeping that prevents identification of problem huts or sows. Without accurate records, producers cannot make data-driven decisions about hut selection or management changes. ### Records and Measurements for Hut Evaluation Maintain the following records specifically for hut evaluation: - Hut inventory log: List each hut by type, identification number, purchase date, and condition. Note any modifications made and dates of repair or replacement. - Hut location map: Record the position of each hut in the farrowing paddock for each group. Note soil drainage, sun exposure, and proximity to wallows or shade. - Hut performance summary: For each hut type, calculate average preweaning mortality, crushing mortality, and weaning weights across all groups. Compare these metrics annually to identify trends. - Cost analysis: Track hut purchase price, maintenance costs, and labor for moving and cleaning. Calculate cost per pig weaned for each hut type to inform future purchasing decisions. Review these records annually and use them to update your hut selection and management decisions. Share summaries with extension specialists or veterinarians for professional input when performance does not meet targets. ## Frequently Asked Questions ### What is the best hut design for outdoor farrowing? Arc-style huts and blunt-top A huts with guard rails have shown lower preweaning mortality compared to inverted U huts. These designs create safe pig areas that reduce crushing. The choice depends on availability, cost, and management preferences. ### How much bedding should I use in farrowing huts? Bedding depth should be 15 to 30 centimeters, adjusted for weather conditions. Increase depth in cold weather and reduce in hot weather. Change bedding when wet or soiled. ### How often should I move farrowing huts? Move huts between farrowing groups to break disease cycles and prevent soil nutrient buildup. The minimum rotation distance should prevent pathogen carryover. Rotate to well-drained locations with good sun exposure. ### What causes high piglet mortality in outdoor farrowing? Crushing by the sow accounts for most preweaning mortality. Hut design that lacks safe pig areas increases crushing risk. Other causes include starvation, diarrhea, and chilling. ### How do I manage heat stress in outdoor farrowing sows? Provide shade over huts and wallow areas. Reduce bedding in hot weather. Ensure adequate ventilation. Wallowing helps sows regulate body temperature. ### What records should I keep for outdoor farrowing? Record sow identification, farrowing dates, piglet numbers, mortality, weaning weights, bedding usage, health issues, and hut locations. Use records to evaluate performance and make management decisions. ### How do I prevent disease in outdoor farrowing systems? Rotate hut locations, clean and disinfect huts between uses, limit visitor access, and monitor animals daily for signs of disease. Consult a veterinarian for disease prevention and control programs. ### When should I intervene during farrowing? Intervene only when necessary, such as prolonged farrowing or visible distress. Record farrowing duration and assist with difficult births following established protocols. Induction should not be conducted more than 2 days before the expected farrowing date. ## Related Farming Guides - [Manure Management For Pig Farms](/knowledge/animal-farming/swine/manure-management-for-pig-farms) - [Systems Biology](/blog/news/systems-biology) - [Farrowing House Preparation And Sow Care](/knowledge/animal-farming/swine/farrowing-house-preparation-and-sow-care) - [Pig Lameness Monitoring And Flooring Management](/knowledge/animal-farming/swine/pig-lameness-monitoring-and-flooring-management) - [Swine Mortality Management And Deadstock Planning](/knowledge/animal-farming/swine/swine-mortality-management-and-deadstock-planning) ## 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) - [FAO Animal Production and Health](https://www.fao.org/animal-production/en). Food and Agriculture Organization of the United Nations. - [Animal Health and Welfare](https://www.nal.usda.gov/animal-health-and-welfare). USDA National Agricultural Library. - [The protective role of wallowing against heat stress in gestating and lactating sows housed outdoors.](https://pubmed.ncbi.nlm.nih.gov/35792155). Physiology & behavior, 2022. - [Does hut climate matter for piglet survival in organic production?](https://pubmed.ncbi.nlm.nih.gov/30113279). Animal : an international journal of animal bioscience, 2019. - [Farrowing hut design and sow genotype (Camborough-15 vs 25% Meishan) effects on outdoor sow and litter productivity.](https://pubmed.ncbi.nlm.nih.gov/11063305). Journal of animal science, 2000. - [Effects of shaded versus unshaded wallows on behavior, performance, and physiology of the outdoor lactating sow.](https://pubmed.ncbi.nlm.nih.gov/18708599). Journal of animal science, 2008. - [Spatial distribution of soil phosphorous fractions following 1-year farrowing sows in an outdoor hog-rearing farm in Eastern Canada.](https://pubmed.ncbi.nlm.nih.gov/32361825). Environmental monitoring and assessment, 2020. - [Effects of stocking rate and crude protein intake during gestation on ground cover, soil-nitrate concentration, and sow and litter performance in an outdoor swine production system.](https://pubmed.ncbi.nlm.nih.gov/12078724). Journal of animal science, 2002. - [Pig Crushing Mortality by Hut Type In Outdoor Farrowing](https://www.semanticscholar.org/paper/6a8ae351384d58090cb106a85eb1f2ddfc83a015). 1997. - [The effects of outdoor farrowing hut type on prewean piglet mortality in Iowa](https://doi.org/10.1079/AJAA200215). American Journal of Alternative Agriculture, 2002. - [Effects of Farrowing Induction on Some Farrowing Characteristics in the Pig - A Review](https://doi.org/10.2478/aoas-2023-0041). Annals of Animal Science, 2023. - [Estimating the time of infection for African swine fever in pig farms in Korea](https://doi.org/10.3389/fvets.2023.1281152). Frontiers in [Veterinary Science](/blog/news/veterinary-science), 2023. - [Assessing the impact of a negative air ionization system on particulate matter and gaseous pollutants in the swine farrowing environment](https://doi.org/10.1371/journal.pone.0316914). PLoS ONE, 2025. - [Comparison of temperature and humidity in three types of outdoor farrowing huts](https://doi.org/10.13031/aea.30.10014). Applied Engineering in Agriculture, 2014. - [The effect of farrowing environment and previous experience on the maternal behaviour of sows in indoor pens and outdoor huts](https://doi.org/10.1017/S1751731114003036). Animal, 2015. > This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.