Swine Barn Ventilation: Designing for Thermal Comfort and Air Quality

Ventilation in swine barns serves two simultaneous purposes: removing heat, moisture, gases, and dust from the animal-occupied zone while delivering fresh air to support pig health and worker safety. A ventilation system that fails on either count creates conditions that reduce growth performance, increase respiratory disease pressure, and elevate occupational health risks for people working inside the barn. This article provides a practical framework for evaluating, designing, or upgrading swine barn ventilation with emphasis on measurable design parameters, system comparisons, and management decisions that can be implemented at farm level.

At a Glance: Ventilation System Comparison

The choice between natural and mechanical ventilation depends on barn type, climate, stage of production, and the level of environmental control required. The table below summarizes the main system types, their operating principles, and the conditions where each performs best.

Mechanical ventilation provides the most consistent control of temperature and air quality across all seasons. Natural ventilation offers lower operating costs but requires more attentive management during weather transitions. The decision framework in the following sections will help match system type to specific barn conditions.

Core Design Parameters for Swine Barn Ventilation

Temperature Targets by Production Stage

Pigs have a thermoneutral zone where they expend minimal energy to maintain body temperature. Outside this zone, pigs divert energy from growth to heating or cooling. Temperature targets vary by body weight and group size. Farrowing rooms require warmer temperatures for newborn piglets, while finishing pigs tolerate cooler conditions. Gestation barns sit between these extremes.

The relationship between temperature and respiratory health deserves particular attention. A study of a commercial herd with endemic porcine pleuropneumonia found that periods of elevated temperature or humidity correlated with increased mortality associated with respiratory disease. This finding underscores that thermal stress is also a performance issue but a disease amplifier in herds already carrying respiratory pathogens. Barn managers should treat temperature excursions as health events, beyond comfort complaints.

Humidity and Moisture Control

Relative humidity in swine barns should generally be maintained between 50 and 70 percent. High humidity combines with dust and gases to create conditions that stress the respiratory tract. Low humidity increases dust suspension in the air. Moisture in the barn comes primarily from pig respiration, manure, and wet cleaning. Ventilation must remove this moisture at a rate that prevents condensation on walls and ceilings.

The interaction between temperature and humidity matters more than either parameter alone. Pigs lose heat through evaporation from the respiratory tract when ambient temperatures rise. High humidity reduces the effectiveness of this evaporative cooling, compounding heat stress. During cold weather, ventilation rates drop to conserve heat, which allows humidity to climb. This seasonal pattern explains why air quality problems concentrate in winter months.

Airflow Rates and Air Exchange

Minimum ventilation rates must remove moisture, gases, and dust while maintaining temperature. Maximum ventilation rates must remove excess body heat during warm weather. Between these extremes, ventilation modulates to match changing conditions.

Air distribution is as important as total airflow. Stagnant zones allow gas and dust accumulation, while drafts cause chilling. Inlet design determines how fresh air mixes with room air before reaching animal level. Cold air falling directly onto pigs creates stress even when average room temperature appears acceptable. The two-zone airflow patterns observed in swine finishing buildings demonstrate that air movement is rarely uniform across the barn. Managers should verify air movement at pig level instead of relying solely on room-average sensors.

Gas Concentrations and Air Quality Limits

Ammonia, hydrogen sulfide, carbon dioxide, and dust are the primary aerial contaminants in swine barns. Ammonia irritates the respiratory tract and reduces disease resistance. Hydrogen sulfide is acutely toxic at high concentrations and poses a lethal hazard during manure agitation. Carbon dioxide accumulates when ventilation is inadequate and serves as a useful indicator of overall air quality.

Volatile organic compounds from manure and feed add to the complex mixture of aerial contaminants in swine facilities. More than 500 VOCs have been identified at swine operations, with compounds such as acetic acid, butyric acid, p-cresol, and skatole contributing to odor and potential health effects. Ventilation dilutes these compounds, but source reduction through manure management offers a complementary approach.

Natural Ventilation Systems

Design Principles for Curtain Barns

Naturally ventilated barns rely on adjustable side curtains and ridge openings to move air. Wind pressure drives air through openings on the windward side, while thermal buoyancy lifts warm air out through the ridge. The system works best when the barn is oriented to capture prevailing winds and when internal obstructions do not block airflow paths.

Curtain adjustment is the primary management tool. Raising curtains increases airflow during warm weather. Lowering curtains conserves heat during cold weather but reduces air exchange. The relationship between curtain position and disease transmission deserves careful attention. A modeling study of airborne disease spread in commercial swine barns found that curtain adjustments could either suppress disease spread by an average of 64.8 percent or exacerbate outbreak potential by an average of 5.8 percent compared to scenarios where side curtains were not raised. This finding demonstrates that curtain management is a disease control decision, beyond a temperature control decision.

Limitations of Natural Ventilation

Natural ventilation cannot provide consistent air distribution during calm weather or extreme temperatures. Wind speed and direction vary, creating periods of inadequate ventilation or excessive drafts. Cold weather presents the greatest challenge because minimum ventilation needs compete with heat conservation. Barns with poor building envelopes suffer uncontrolled infiltration that bypasses the designed air inlet system.

The infiltration characteristics of swine finishing and gestation buildings vary considerably based on construction quality and age. Uncontrolled air leaks through cracks, gaps around doors, and poorly sealed wall junctions undermine the performance of both natural and mechanical ventilation systems. Sealing the building envelope is a prerequisite for controlled ventilation.

Curtain Management Protocols

Effective curtain management requires frequent adjustment based on weather conditions. During spring and fall, conditions can change rapidly within a single day. Managers should establish clear protocols for curtain position based on temperature, wind speed, and pig behavior. Pigs lying in a pile indicate cold stress and curtains should be lowered. Pigs spread out and panting indicate heat stress and curtains should be raised.

Wind speed modifies the effect of curtain position. High winds can drive cold air directly onto pigs even with curtains partially closed. Windbreaks and baffles inside the barn can reduce draft exposure. During extreme cold, some barns use supplemental heat to allow higher ventilation rates without chilling pigs.

Mechanical Ventilation Systems

Negative-Pressure Systems

Negative-pressure ventilation is the most common mechanical system in modern swine barns. Exhaust fans mounted in walls or pits pull air out of the building, creating a slight vacuum that draws fresh air through controlled inlets. The location and adjustment of inlets determine air distribution. Fans cycle on and off or modulate speed to match ventilation demand.

Fan selection and placement significantly affect disease transmission patterns within the barn. A computational fluid dynamics study that optimized ventilation fan selection and placement through genetic algorithm integration found that optimized configurations reduced disease spread by an average of 20 percent compared to original barn settings. This finding suggests that fan layout deserves the same design attention as total airflow capacity.

Positive-Pressure and Filtration Systems

Positive-pressure systems push air into the barn through fans, often with filtration to remove pathogens. These systems are used in breeding herds and boar studs where disease exclusion is a priority. The building envelope must be well sealed to prevent unfiltered air from entering through leaks. Positive pressure also prevents outside air from being drawn in through cracks, which is an advantage for biosecurity.

Filtration adds significant cost and management complexity. Filter maintenance, pressure differential monitoring, and backup power are essential components. The modeling of airborne virus concentrations in filtered swine barns with negative-pressure ventilating systems shows that filtration effectiveness depends on achieving uniform airflow through the filter media and maintaining negative pressure within design parameters.

Tunnel Ventilation for Heat Stress

Tunnel ventilation moves air lengthwise through the barn at high velocity, creating wind chill that helps pigs cope with heat stress. Inlet shutters at one end of the barn open while exhaust fans at the opposite end pull air through the building. Air speeds of 60 to 120 meters per minute are typical in tunnel mode. Evaporative cooling pads can be added to reduce incoming air temperature.

Tunnel ventilation requires careful attention to inlet design and internal obstructions. Pens, gates, and solid partitions disrupt airflow and create dead zones. The system works best in long, narrow barns with minimal internal barriers. During tunnel operation, the barn operates at high ventilation rates that also remove gases and dust effectively.

Ground Channel Ventilation

Ground channel ventilation draws air through channels beneath the slatted floor before it enters the animal-occupied zone. The earth tempers the incoming air, cooling it during summer and warming it during winter. A study of a ground channel system in a swine-finishing barn found that it reduced incoming air temperature from 26.9 degrees Celsius to 22.5 degrees Celsius during summer while maintaining steady barn temperatures around 28.0 degrees Celsius. During late autumn and winter, the system warmed inlet air from 4.7 and minus 0.7 degrees Celsius to 8.1 and 6.8 degrees Celsius respectively, maintaining room temperatures near 25 degrees Celsius.

The same study found that ammonia emissions remained consistent across seasons, with values of 111.0 grams per day per animal unit in summer, 125.0 in late autumn, and 107.1 in winter. This consistency suggests the ground channel system balanced ventilation rates with emission control effectively. The system improved air quality during cold seasons without compromising thermal comfort.

Air Quality Management and Emission Control

Ammonia and Hydrogen Sulfide

Ammonia and hydrogen sulfide originate primarily from manure decomposition. Under-floor slurry storage creates a concentrated source of these gases directly beneath the animals. Ventilation removes these gases from the animal-occupied zone, but the ventilation rate required for gas control may exceed the rate required for temperature control, particularly during cold weather.

Manure management practices can reduce gas production at the source. Pit recharge systems that remove stored manure and return aerobically treated liquid have shown significant emission reductions. One evaluation of a semi-continuous pit manure recharge system found mean reductions of 49 percent for ammonia and 82 percent for hydrogen sulfide emissions over 14 days of measurement. The higher removal efficiency for hydrogen sulfide was attributed to the pH of the aerobically treated liquid remaining slightly above 8.

Seasonal conditions affect pit recharge system performance. A summer study comparing pit recharge to conventional slurry storage found 31 percent greater ammonia emissions from the pit recharge system, with higher ammonia concentrations inside the barn. Hydrogen sulfide emissions were 55 percent lower in the pit recharge system. These results indicate that system performance varies with diet, temperature, and nitrogen loading, and managers should verify performance under their specific conditions.

Slurry Removal Safety

Slurry removal creates extreme hazards because agitation releases large quantities of hydrogen sulfide and other gases. A study of deep-pit swine finishing facilities found that hydrogen sulfide emissions increased by an average of 61.9 times relative to before-removal levels during agitation. Ammonia emissions increased by 4.6 times during agitation, and odor emissions increased by 3.4 times. These elevations persisted for the duration of the agitation process, which averaged about 8 hours.

Maintaining adequate barn ventilation regardless of animal comfort demand is essential during slurry removal. The study emphasized that ventilation must continue at rates sufficient to protect both animals and workers even when temperature control would suggest lower airflow. Entry into manure pits or confined spaces requires respiratory protection and cannot be done safely without it. Workers should follow established confined space entry protocols and never enter pits without proper training, equipment, and backup.

Dust Control

Dust in swine barns carries endotoxins, bacteria, and odorous compounds. Inhalable dust concentrations increase during winter when ventilation rates drop to conserve heat. A study of a mobile recirculating ventilation system with high-efficiency particulate filters in a farrowing barn found that the system reduced inhalable dust by 25 percent and respirable dust by 48 percent compared to an untreated control room. The system operated at a flow rate of 45 cubic meters per minute, providing 5 room air exchanges per hour.

Dust control through filtration or electrostatic systems can complement ventilation. Electrostatic particle ionization and electrostatic space charge systems have been evaluated for improving barn air quality. These technologies charge dust particles so they adhere to surfaces instead of remaining airborne. Oil application to floors and surfaces can also suppress dust resuspension.

Odor Management

Odor from swine facilities affects neighbors and contributes to the environmental footprint of pork production. Odorous VOCs include volatile fatty acids, phenolic compounds, and sulfur-containing compounds. Ventilation dilutes these compounds but does not eliminate them. Source reduction through manure treatment, dietary manipulation, and building design offers additional control options.

A two-airspace building design has been evaluated for reducing odor and ammonia emissions. This approach separates the animal-occupied zone from the manure storage area, allowing independent ventilation of each space. Removing gases near the source reduces the ventilation demand in the animal zone and lowers total emissions.

Design Decision Framework

Step 1: Define Production Stage and Facility Type

Each production stage has distinct ventilation requirements. Farrowing rooms need precise temperature control for newborn piglets and sows. Nursery rooms require higher minimum ventilation rates to manage moisture and gases from young pigs with high metabolic rates. Gestation and finishing barns tolerate wider temperature ranges but still need adequate air exchange.

Step 2: Assess Climate and Weather Patterns

Local climate determines the balance between heating and cooling demands. Cold climates require well-sealed buildings with efficient minimum ventilation and supplemental heat. Hot climates require high-capacity ventilation for heat removal, possibly with evaporative cooling. Temperate climates may allow natural ventilation for some production stages.

Step 3: Evaluate Building Envelope Condition

Inspect the building for air leaks, insulation condition, and structural integrity. Uncontrolled infiltration undermines ventilation control. Seal cracks, repair damaged walls, and verify that doors and curtains seal properly when closed. Insulation reduces heat loss in winter and heat gain in summer, lowering the ventilation demand needed to maintain temperature.

Step 4: Calculate Ventilation Requirements

Ventilation requirements are based on animal weight, number of animals, and desired temperature and humidity conditions. Minimum ventilation removes moisture and gases. Maximum ventilation removes heat. The design should provide a range of airflow between these limits with controls that modulate smoothly.

Step 5: Select System Type and Components

Match the system to the facility and management capacity. Natural ventilation suits facilities where managers can adjust curtains frequently and where climate conditions are moderate. Mechanical ventilation provides more consistent control but requires reliable power, regular maintenance, and backup systems. Filtration adds biosecurity capability but increases cost and management complexity.

Step 6: Plan Air Distribution

Inlet placement and design determine how fresh air reaches the animals. Inlets should distribute air evenly across the barn and direct it upward to mix with warm room air before descending to animal level. Obstructions such as solid pen partitions and feed bins disrupt airflow patterns. Consider the placement of sick pens and their relationship to airflow, since the location of sick animals influences disease transmission dynamics within the barn.

Step 7: Install Monitoring and Alarm Systems

Temperature sensors, alarm systems, and backup power are essential components of mechanical ventilation. Sensors should be placed at animal level in multiple locations to detect temperature gradients. Alarms should alert managers to fan failure, power loss, or temperature excursions. Backup generators should be tested regularly and sized to carry the full ventilation load.

Step 8: Develop Standard Operating Procedures

Written procedures for seasonal ventilation adjustments, fan maintenance, filter replacement, and emergency response ensure consistent management. Train all employees on ventilation principles, alarm response, and slurry removal safety. Document settings and changes to track system performance over time.

Records and Measurements

What to Measure

Regular measurement of temperature, humidity, and gas concentrations provides the data needed to evaluate ventilation performance. Temperature and humidity sensors should be checked for accuracy and calibrated periodically. Gas detection tubes or electronic monitors can measure ammonia, hydrogen sulfide, and carbon dioxide concentrations at animal level and in worker breathing zones.

Air speed measurements at animal level reveal distribution problems that temperature sensors miss. Anemometers can measure airflow at inlets, through pens, and at exhaust points. Comparing measured airflow to design values identifies fan deterioration, inlet blockage, or duct leaks.

Record Keeping

Maintain a ventilation log that records daily temperature and humidity readings, ventilation settings, fan operation, and any alarms or adjustments. Record gas concentration measurements taken at regular intervals. Document maintenance activities including fan cleaning, belt replacement, filter changes, and calibration.

Seasonal records are particularly valuable. Comparing ventilation performance across seasons identifies patterns that inform adjustments. Records of disease outbreaks, mortality, and treatment rates can be correlated with ventilation data to identify environmental triggers. A herd with endemic respiratory disease may show increased mortality during periods of elevated temperature or humidity, and ventilation records can confirm or refute this relationship.

Performance Indicators

Track ventilation system performance through measurable indicators. Fan airflow should be tested periodically and compared to rated capacity. Static pressure measurements indicate filter loading or inlet blockage. Energy consumption per animal place provides a cost indicator that can be compared across seasons and facilities.

Air quality indicators include gas concentrations, dust levels, and odor intensity. These measurements should be taken at consistent locations and times to allow comparison. Worker symptom surveys can identify respiratory irritation that may indicate inadequate ventilation.

Common Failure Patterns

Winter Air Quality Failure

The most common ventilation failure occurs during cold weather when managers reduce ventilation to conserve heat. Ammonia, humidity, and dust concentrations climb as air exchange drops. Pigs develop coughs and reduced feed intake. Workers experience eye and respiratory irritation. The solution is to maintain minimum ventilation rates and add supplemental heat instead of sacrificing air quality.

Summer Heat Stress

Inadequate maximum ventilation capacity causes heat stress during hot weather. Pigs pant, reduce feed intake, and seek cool surfaces. Sows may abort or produce smaller litters. Tunnel ventilation or evaporative cooling may be needed in hot climates. Ventilation capacity should be sized for the hottest expected conditions, not average summer weather.

Poor Air Distribution

Even with adequate total airflow, poor distribution creates hot and cold zones within the barn. Pigs cluster in comfortable areas and avoid drafts. Inlet adjustment, baffle placement, and fan location all influence distribution. Air speed measurements at multiple locations identify problem areas.

Fan and Equipment Failure

Fan belts stretch, blades accumulate dust, and motors fail. A single fan failure can create a dead zone in one section of the barn. Regular maintenance and spare parts reduce downtime. Alarm systems alert managers to failures before animal health is compromised.

Power Outage

Power loss stops mechanical ventilation completely. In summer, heat builds rapidly and pigs can die within hours. In winter, humidity and gases accumulate. Backup generators must start automatically and carry the full ventilation load. Regular generator testing under load verifies readiness.

Manure Handling Hazards

Slurry agitation and removal create acute gas hazards that ventilation alone cannot fully mitigate. Hydrogen sulfide concentrations can reach lethal levels during agitation. Workers should evacuate animals and people from the barn during agitation when possible, maintain maximum ventilation, and use appropriate respiratory protection. Never enter manure pits or confined spaces without proper training and equipment.

Welfare and Worker Safety Context

Animal Welfare Implications

Ventilation directly affects pig welfare through thermal comfort, air quality, and disease pressure. Pigs unable to maintain thermal comfort experience stress that suppresses immune function and reduces growth. Poor air quality irritates the respiratory tract and increases susceptibility to respiratory pathogens. Porcine respiratory disease complex contributes to reduced growth performance, increased mortality, and elevated treatment costs in commercial swine production.

Housing and management systems influence respiratory health through their effects on air quality and ventilation. Comparative studies of pulmonary architecture in swine raised under different management systems show measurable differences in alveolar structure, fibrosis, and macrophage distribution. These findings confirm that the barn environment leaves a lasting imprint on lung health.

Worker Health and Safety

Occupational exposure to swine barn air is associated with cough, wheezing, and shortness of breath. Published data indicates that 20 to 40 percent of hog confinement workers experience such symptoms. Endotoxin, a component of hog barn dust, is associated with respiratory disease in workers. Proper design and management of barn ventilation systems is critical for maintaining temperature and humidity for animal growth and for decreasing the levels of gases and respirable dusts that affect workers.

Respiratory protection should be considered for workers in dusty conditions. Some jobs cannot be done safely without respiratory protection, particularly entering manure pits. A respiratory protection program may also serve as a biosecurity measure to protect animals from human pathogens such as influenza virus. Workers with respiratory symptoms should be evaluated by a health care provider and fitted with appropriate respirators.

Biosecurity Considerations

Ventilation systems influence biosecurity through their effect on airborne pathogen movement. Air filtration can exclude pathogens from entering herds, while airflow patterns within barns determine how pathogens spread between pens. The placement of sick pens and the ventilation configuration play crucial roles in modifying disease dissemination dynamics at the barn level.

Insect exclusion is another biosecurity consideration. Mosquitoes and other insects can transmit diseases and cause mechanical damage to pigs. Housing features that exclude insects reduce disease transmission risk and stress-related production losses. Ventilation openings must balance airflow needs with insect exclusion.

Professional Escalation Criteria

When to Consult a Ventilation Engineer

Consult a ventilation engineer or agricultural engineer when designing a new barn, major renovation, or ventilation upgrade. Engineering expertise is needed for fan selection, inlet design, duct sizing, and control system specification. Attempting to design ventilation without engineering input risks undersized or poorly distributed systems that are expensive to correct.

When to Consult a Veterinarian

Involve a veterinarian when respiratory disease patterns suggest an environmental component. Increased coughing, elevated mortality, or poor response to treatment may indicate ventilation problems. A veterinarian can help distinguish infectious causes from environmental triggers and recommend diagnostic testing. The correlation between climatic stress and respiratory mortality in herds with endemic disease highlights the need for veterinary involvement when environmental conditions and disease interact.

When to Seek Industrial Hygiene Assistance

Industrial hygiene professionals can conduct comprehensive air quality assessments including gas, dust, and endotoxin measurements. They can evaluate worker exposures against occupational exposure limits and recommend controls. If workers report persistent respiratory symptoms, an industrial hygiene assessment is warranted.

When to Contact Emergency Services

Call emergency services immediately if anyone experiences symptoms of hydrogen sulfide exposure including headache, dizziness, nausea, or loss of consciousness. Hydrogen sulfide can cause rapid loss of consciousness and death at high concentrations. Never attempt to rescue someone from a manure pit without proper respiratory protection and rescue equipment. Multiple fatalities have occurred when untrained rescuers entered pits to help others.

Frequently Asked Questions

What is the minimum ventilation rate for a swine barn?

Minimum ventilation rates are calculated based on animal weight, number of animals, and the need to remove moisture and gases. The rate must be sufficient to keep ammonia, hydrogen sulfide, and carbon dioxide below concentrations that irritate the respiratory tract. Minimum ventilation typically operates during cold weather when heat conservation competes with air quality needs. Consult ventilation design resources or an agricultural engineer for rates specific to your barn dimensions and pig inventory.

How do I know if my barn has adequate ventilation?

Measure temperature, humidity, and gas concentrations at animal level in multiple locations. Observe pig behavior for signs of heat or cold stress. Check for condensation on walls and ceilings. Measure air speed at pig level to verify distribution. Compare your measurements to design targets and investigate any readings outside acceptable ranges.

Should I use natural or mechanical ventilation for my finishing barn?

The choice depends on your climate, barn design, and management capacity. Natural ventilation works well in temperate climates with attentive management and moderate temperature extremes. Mechanical ventilation provides more consistent control and is generally required for farrowing and nursery facilities. Some finishing barns use natural ventilation during mild weather and mechanical ventilation during extremes.

How often should ventilation fans be cleaned and serviced?

Fan maintenance frequency depends on dust levels and operating hours. Inspect fans monthly and clean blades, shutters, and guards. Check belt tension and replace worn belts. Verify that shutters open and close freely. Test fan airflow periodically and compare to rated capacity. Follow manufacturer recommendations for motor lubrication and bearing replacement.

What should I do if ammonia levels are high in my barn?

First, verify that minimum ventilation is operating correctly and inlets are not blocked. Increase ventilation if temperature allows. Check manure handling systems for proper function and consider more frequent pit recharge or removal. Evaluate diet formulation for nitrogen content. If ammonia remains high despite ventilation adjustments, consult an agricultural engineer or ventilation specialist.

How can I reduce dust in my swine barn?

Dust control combines ventilation with source reduction. Maintain adequate ventilation to dilute and remove airborne dust. Consider oil application to floors and surfaces to suppress resuspension. Evaluate electrostatic or filtration systems for additional control. Manage feed to minimize dust generation. Reduce dust at the source through feed formulation and handling practices.

What ventilation settings should I use during slurry removal?

Maintain maximum ventilation during slurry agitation and removal regardless of temperature. Hydrogen sulfide emissions increase dramatically during agitation and can reach lethal concentrations. Remove animals from the barn when possible. Keep all people out of the barn during agitation unless wearing appropriate respiratory protection. Continue high ventilation for several hours after agitation ends.

How does ventilation affect disease transmission between pens?

Airflow patterns determine how airborne pathogens move between pens. Computational fluid dynamics studies show that ventilation configuration and fan placement influence disease dissemination. Curtain adjustments in naturally ventilated barns can either suppress or exacerbate disease spread depending on how they alter airflow. Sick pen placement also affects transmission dynamics. Work with a veterinarian and engineer to optimize ventilation for disease control.

Related Farming Guides

• Pig Barn Ventilation and Thermal Comfort
• Swine Barn Air Quality and Ammonia Monitoring
• Cattle Confinement Barns: Design, Ventilation, and Bedding Systems
• Beef Cattle Housing Systems: Barn Design, Bedding, and Ventilation
• Sheep Barn Plans: Design Considerations for Housing, Lambing, and Handling

References and Further Reading

• FAO Animal Production and Health. Food and Agriculture Organization of the United Nations.
• Animal Health and Welfare. USDA National Agricultural Library.
• Animal and Veterinary Resources. U.S. Food and Drug Administration.
• Animal Health and Welfare. World Organisation for Animal Health.
• Animal Production and Protection. USDA Agricultural Research Service.
• A CFD-informed barn-level swine disease dissemination model and its use for ventilation optimization.. Epidemics, 2025.
• Seasonal and Diurnal Ammonia Emissions from Swine-Finishing Barn with Ground Channel Ventilation.. Animals : an open access journal from MDPI, 2025.
• Volatile organic compounds at swine facilities: a critical review.. Chemosphere, 2012.
• Emissions of ammonia, hydrogen sulfide, and odor before, during, and after slurry removal from a deep-pit swine finisher.. Journal of the Air & Waste Management Association (1995), 2006.
• Use of prototype side stream filtration system to control dust levels in a commercial swine farrowing building.. Journal of occupational and environmental hygiene, 2023.
• Respiratory issues in beef and pork production: recommendations from an expert panel.. Journal of agromedicine, 2010.
• Short communication: Use of a portable, automated, open-circuit gas quantification system and the sulfur hexafluoride tracer technique for measuring enteric methane emissions in Holstein cows fed ad libitum or restricted.. Journal of dairy science, 2015.
• Evaluation of TiO(2) Based Photocatalytic Treatment of Odor and Gaseous Emissions from Swine Manure with UV-A and UV-C.. Animals : an open access journal from MDPI, 2021.
• Socioeconomic and ecological drivers of contagious pig diseases in free-range systems: Evidence from Gwembe Valley, Zambia.. 2026.
• Environmental Biofilms in Livestock Production Systems: Reservoirs of Pathogens and Antimicrobial Resistance. 2026.
• Epidemiological Analysis of Environmental Factors Affecting Porcine Pleuropneumonia in a Herd Endemic for &lt,i&gt,Actinobacillus pleuropneumoniae&lt,/i&gt,.. 2026.
• Comparative lobe-specific histomorphometric evaluation of pulmonary architecture, fibrosis, and alveolar macrophage distribution in swine raised under different management systems.. 2026.
• Framing a pig welfare assessment protocol suitable for smallholder settings in low-to-middle income countries.. 2026.
• Environmental Biofilms in Livestock Production Systems: Reservoirs of Pathogens and Antimicrobial Resistance.. 2026.
• Exploring definitions of porcine respiratory disease complex in the literature: a scoping review protocol.. 2026.
• Barrier or breach? Assessing swine housing features for mosquito threats.. 2025.
• Assessment of the Performance of Electrostatic Space Charge System (ESCS) at Improving Barn Air Quality. 2013.
• A Bio-Aerosol Transmission Test System for Assessment of Electrostatic Particle Ionization (EPI) in Improving Barn Air Quality. 2013.
• Impact of in-barn manure separation on biological air quality in an experimental setup identical to that in swine buildings.. Journal of Agricultural Safety and Health, 2009.
• Impact of In-Barn Manure Separation on the Biological Air Quality of Swine Buildings. 2005.
• Effect of aerobically treated manure on odorous material emissions from a swine finishing barn equipped with a continuous pit recirculation system. Animal bioscience, 2021.
• Evaluation of Semi-Continuous Pit Manure Recharge System Performance on Mitigation of Ammonia and Hydrogen Sulfide Emissions from a Swine Finishing Barn. Atmosphere, 2019.
• Effects of Treated Manure Conditions on Ammonia and Hydrogen Sulfide Emissions from a Swine Finishing Barn Equipped with Semicontinuous Pit Recharge System in Summer. Atmosphere, 2020.
• Modeling airborne virus concentrations in filtered swine barns with negative-pressure ventilating systems. Transactions of the Asabe, 2018.
• Infiltration characteristics of swine finishing and gestation buildings: Review and quantification. American Society of Agricultural and Biological Engineers Annual International Meeting 2015, 2015.
• Two zone airflow model for a swine finishing building. Asabe Proceedings of the International Symposium on Air Quality and Waste Management for Agriculture, 2007.
• A two-airspace building design to reduce odor and ammonia emissions. Applied Engineering in Agriculture, 2010.

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.