Nursery Pig Ventilation and Temperature Control

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

Nursery pigs require a precise thermal environment, with floor temperatures of 85-90°F for the first week, gradually decreasing by 2-3°F weekly, and air temperatures at pig level of 80-82°F initially. This ensures energy is directed towards growth rather than thermoregulation, mitigating risks of scours and mortality associated with cold stress.
Continuous minimum ventilation is critical, providing 2-3 cubic feet per minute per pig initially, to remove moisture and ammonia (target <10 ppm) while supplying oxygen, even in cold weather. Failure to ventilate adequately leads to increased humidity (>70% RH) and respiratory irritants, compromising immune function and growth.
Air speed at pig level should be maintained below 50 feet per minute for young pigs to prevent chilling drafts, which can increase susceptibility to disease. In summer, higher air speeds (100-200 fpm) are beneficial for cooling, provided ambient air temperature is warm.
Monitoring temperature at pig level, not human eye level, is paramount, as discrepancies can be significant. Daily checks of temperature records and pig behavior (huddling, spreading out, panting) are essential for timely adjustments to heating and ventilation systems.
Supplemental localized heat sources like heat lamps, pads, or brooders are necessary in the first week to create a warm zone (85-90°F) in conjunction with room heating, allowing piglets to choose their preferred thermal environment.

Raising nursery pigs is one of the most demanding phases of swine production. The weaned piglet faces a sudden separation from the sow, a change in diet, and a new environment all at once. Among the many stressors, temperature and air quality are the most critical factors that determine whether a pig thrives or falters in the first weeks after weaning. This guide covers the principles of nursery pig ventilation and temperature control, including how to set up your barn, manage heating and cooling systems, monitor air quality, and troubleshoot common problems. It is written for swine producers, farm managers, and employees who want practical, actionable guidance to improve piglet comfort, health, and growth performance.

At a Glance

Nursery pigs need a floor temperature of 85 to 90 degrees Fahrenheit for the first week after weaning, then reduce by 2 to 3 degrees each week.
Air temperature in the room should be 80 to 82 degrees Fahrenheit at pig level for the first week, slightly cooler than the floor.
Ventilation has two jobs: remove moisture, ammonia, and odors, and bring in fresh oxygen. Minimum ventilation must run continuously, even in cold weather.
Air speed at pig level should be less than 50 feet per minute for young pigs. Drafts chill pigs quickly and increase scours and mortality.
Set your minimum ventilation rate to about 2 to 3 cubic feet per minute per pig for the first week, then increase as pigs grow.
Relative humidity in the nursery should stay between 50 and 70 percent. High humidity means you are not removing enough moisture.
Ammonia levels should stay below 10 parts per million at pig height. If you can smell it, it is too high.
Check temperature records daily. A change of 2 degrees from your set point deserves investigation.
Do not rely on the room thermostat alone. Measure temperature at pig level, not at human eye level.
In the first week, pigs need supplemental heat from heat lamps, pads, or brooders in addition to room heating.

Why Nursery Pigs Need Precise Temperature and Ventilation

The nursery phase is a period of intense transition. Piglets are weaned at 3 to 4 weeks of age in most commercial systems. Their immune systems are still developing, their digestive systems are adapting to solid feed, and they no longer have the sow's body heat or milk to rely on. The piglet's ability to regulate its own body temperature is limited. They have a high surface area to body weight ratio, meaning they lose heat quickly. They also have minimal body fat and a limited ability to shiver effectively for long periods.

When a piglet gets cold, it uses energy to stay warm instead of growing. Feed intake drops, immune function suffers, and the pig becomes more susceptible to scours, respiratory disease, and other infections. Cold pigs huddle together, which can lead to crushing and reduced access to feed and water. On the other hand, if the nursery is too warm, pigs will spread out and avoid the heat source. They may drink more water and eat less feed, which also hurts growth. Overheating can also lead to lethargy and reduced feed intake, similar to the effects of heat stress in finishing pigs.

Ventilation is not just about temperature. It is about air quality. Pigs produce moisture through respiration and manure. Their waste breaks down and releases ammonia, hydrogen sulfide, and other gases. Without proper ventilation, these gases accumulate and irritate the respiratory tract. Pigs in poorly ventilated nurseries develop chronic coughing, increased susceptibility to pneumonia, and reduced growth rates. Dust from feed and bedding also accumulates and can carry pathogens. Good ventilation removes these contaminants and brings in fresh air, but it must do so without creating drafts that chill the pigs.

The nursery period lasts roughly 6 to 8 weeks, depending on your weaning age and target weight. During this time, the pig's thermal needs change dramatically. A 12 pound piglet has very different needs than a 40 pound pig. Your ventilation and heating system must be flexible enough to adapt to these changing needs, as well as to outdoor weather conditions.

Understanding Piglet Temperature Requirements

To set up your nursery correctly, you must understand the concept of the thermal neutral zone. This is the range of temperatures where a pig does not have to expend extra energy to stay warm or cool down. Within this zone, feed is used for growth rather than temperature regulation. For a newly weaned pig, the thermal neutral zone is narrow, roughly 82 to 88 degrees Fahrenheit. As the pig grows, this zone shifts downward.

The critical temperature is the lower limit of the thermal neutral zone. Below this point, the pig must increase heat production to maintain body temperature. For a 12 to 15 pound pig, the critical temperature is around 85 degrees Fahrenheit. For a 50 pound pig, it drops to about 65 degrees Fahrenheit. This is why you must gradually reduce nursery temperatures as pigs grow. Keeping the barn too warm for older nursery pigs wastes energy and reduces feed intake.

Floor temperature matters more than air temperature for young pigs. A piglet loses heat through conduction when lying on a cold floor. Concrete floors are especially problematic because they conduct heat away from the pig's body quickly. Plastic slatted floors are better but still cool. If the floor is cold, even warm air will not keep pigs comfortable. You need to provide a warm zone where pigs can lie down and stay warm.

The rule of thumb is to start nursery temperature 5 to 7 degrees warmer than the temperature at weaning. If sows are weaned at 75 degrees, start the nursery at 80 to 82 degrees air temperature. Floor temperature should be 85 to 90 degrees for the first week. This gives the piglet a warm surface to lie on while the air around it stays cooler to encourage feed intake.

Types of Nursery Ventilation Systems

There are two main approaches to ventilating a nursery barn: natural ventilation and mechanical ventilation. Most modern nurseries use mechanical systems because they give you precise control over air movement and temperature. However, some smaller operations use natural ventilation, especially in mild climates.

Mechanical Ventilation Systems

Mechanical ventilation uses fans to move air through the barn. There are three common configurations: positive pressure, negative pressure, and neutral pressure.

Negative pressure systems are the most common in commercial nurseries. Fans exhaust air from one end of the barn, creating a slight vacuum that draws fresh air in through inlets on the opposite wall or ceiling. This gives you good control over air distribution and is energy efficient. The key is to match inlet openings to fan capacity so that incoming air moves at the right speed and direction.

Positive pressure systems push air into the barn, creating a slight positive pressure that forces air out through openings. These are less common but can be useful in situations where you want to filter incoming air or in buildings that are hard to seal. They are more prone to drafts if not designed carefully.

Neutral pressure systems use both supply fans and exhaust fans in balance. These are less common in swine facilities.

Within mechanical systems, you will have staged fans. A minimum fan runs continuously to provide basic air exchange. As the temperature rises, additional fans kick in to increase airflow. Variable speed fans are also available and can adjust airflow more smoothly, which reduces temperature swings.

Air Inlets

Air inlets are just as important as fans. The inlet controls where fresh air enters and how fast it moves. In cold weather, you want incoming air to enter near the ceiling and move across the ceiling before dropping down to pig level. This allows the cold air to mix with warm room air before it reaches the pigs. In warm weather, you may want air to enter directly at pig level to create a cooling breeze.

Common inlet types include ceiling inlets, wall inlets, and baffle inlets. Ceiling inlets are common in nurseries and direct air along the ceiling. Wall inlets are mounted on sidewalls and can be adjusted to direct air up or down. Baffle inlets are simple flaps that can be opened or closed to adjust airflow. The key is to have inlets that are adjustable and that you can calibrate to match fan operation.

Natural Ventilation

Natural ventilation relies on wind and thermal buoyancy to move air through the barn. It is less expensive to operate but offers less control. Curtain-sided nurseries can use natural ventilation in mild weather, but they are difficult to manage in extreme cold or heat. If you use natural ventilation, you need a backup mechanical system for temperature extremes. Most producers find that mechanical ventilation is worth the investment for nursery pigs because of the precise control it provides.

Heating Systems for Nursery Barns

In most climates, you will need supplemental heat in the nursery, especially during the first few weeks after weaning. There are several options, and many barns use a combination of room heating and localized heating.

Room Heaters

Room heaters warm the entire nursery to the desired air temperature. Common types include forced air furnaces, radiant heaters, and unit heaters that use propane, natural gas, or electricity. Forced air furnaces are common because they can also be used to circulate air. Radiant heaters warm objects and surfaces rather than the air itself, which can be efficient but may not warm the room evenly.

For a nursery, you want a heating system that can maintain a steady temperature with minimal swings. A system that cycles on and off frequently can cause temperature fluctuations that stress pigs. Look for heaters with good thermostats and consider using multiple smaller heaters rather than one large unit to get more even heat distribution.

Heat Lamps

Heat lamps provide localized heat for young pigs. They are typically mounted over a solid floored area in the pen, creating a warm zone where pigs can lie. Heat lamps are simple and inexpensive, but they have some drawbacks. They can be a fire hazard if not mounted properly. They also produce light, which can disrupt pig behavior if left on at night. Some producers use red heat lamps because the red light is less disruptive than white light.

Heat Pads and Mats

Heat pads are electric heating elements embedded in a pad that pigs can lie on. They are placed on the floor in a designated lying area. Heat pads provide even heat from below, which is very effective for young pigs. They are safer than heat lamps and do not produce light. However, they are more expensive to install and can be damaged by pigs chewing on cords or by power washing.

Brooders

Brooders are radiant heaters mounted above the floor that direct heat downward. They can be gas fired or electric. Brooders create a warm zone that pigs can move in and out of as they choose. They are commonly used in farrowing and nursery facilities. The heat output can be adjusted to match pig age and temperature needs.

A good approach is to use room heating to maintain a baseline temperature of around 75 to 78 degrees Fahrenheit, then use localized heat sources such as pads or brooders to create a warmer zone of 85 to 90 degrees for the first week. This gives pigs a choice. They can lie in the warm zone or move to a cooler area to eat and drink.

Setting Up the Nursery Before Pig Arrival

Preparation starts before the pigs arrive. A clean, dry, warm barn is essential for a good start. Follow these steps in the days before weaning.

Clean and disinfect the nursery thoroughly. Remove all organic matter, wash with hot water and detergent, and apply a disinfectant approved for swine facilities. Allow the barn to dry completely. Residual moisture increases humidity and makes it harder to heat the barn.

Check all equipment. Verify that heaters work, fans turn on, inlets open and close, and thermostats are accurate. Replace worn belts on fans, clean fan blades, and check that shutters operate freely. Check heat lamps for damaged cords and secure mounting. Test heat pads to ensure they reach the correct temperature.

Set your thermostats 24 hours before pigs arrive. Start the heating system early so the barn and floors are warm when the pigs enter. Concrete floors take a long time to warm up, so preheating is essential. If you are using heat pads, turn them on well in advance. The goal is to have the floor at 85 to 90 degrees and the air at 80 to 82 degrees when the first pig enters.

Set up the pens with clean, dry bedding if you are using solid floors. For slatted floors, make sure the slats are clean and in good repair. Provide fresh feed and water. Check drinker height and flow rate. Nipple drinkers should be set at pig shoulder height. Water flow should be about 1 to 2 cups per minute for nursery pigs.

Managing Temperature in the First Week

The first week after weaning is the most critical. Pigs are adjusting to their new environment and are most vulnerable to temperature stress. Your goal is to keep pigs comfortable and encourage them to eat and drink early.

Start with floor temperature at 85 to 90 degrees and air temperature at 80 to 82 degrees. If you are using heat lamps or brooders, place them over the solid floored lying area. Make sure the warm zone covers enough space for all pigs to lie down at the same time. A good rule is to provide about 1.5 to 2 square feet of warm floor space per pig in the first week.

Observe pig behavior to check if the temperature is right. Pigs that are comfortable will lie evenly scattered in the warm zone, often on their sides with legs extended. If pigs are huddled together in a pile, they are too cold. Turn up the heat or add more localized heat. If pigs are lying away from the warm zone, spread out, and avoiding the heat source, they are too warm. Reduce heat or lower the room temperature.

Pigs that are too cold will also be vocal, and you may see increased shivering. Their skin may look pale or mottled. Pigs that are too warm will be lethargic, pant, and drink more water. They may also have reddened skin.

Check the temperature at pig level, not at your eye level. The temperature at floor level can be several degrees different from the temperature at 5 feet up. Use a thermometer placed at pig level, or use an infrared thermometer to check floor temperature. Walk the barn several times a day and check conditions in multiple pens. The temperature can vary across the barn, with areas near doors and inlets being cooler.

During the first 24 to 48 hours, you may need to make small adjustments. Do not make large changes all at once. Adjust the temperature by 1 to 2 degrees and observe pig response for several hours. Large swings in temperature are stressful to pigs.

Reducing Temperature as Pigs Grow

After the first week, you can begin to reduce the temperature gradually. The goal is to reduce air temperature by about 2 to 3 degrees each week. By the fourth week in the nursery, the air temperature should be around 72 to 75 degrees. By the time pigs leave the nursery at 6 to 8 weeks, the temperature can be around 65 to 70 degrees.

The exact schedule depends on your weaning age, pig weight, and the season. Larger pigs can handle cooler temperatures. The key is to watch pig behavior and adjust accordingly. If pigs are piling, they are too cold and you need to slow the temperature reduction. If they are spread out and avoiding the warm zone, you can reduce the temperature faster.

When you reduce the room temperature, also adjust the localized heat sources. You can raise heat lamps higher or reduce the setting on heat pads or brooders. By the second or third week, you may be able to turn off localized heat during the day and only use it at night. By the fourth week, most pigs no longer need localized heat if the room temperature is adequate.

Remember that temperature needs also vary with feed intake. Pigs that are eating well generate more body heat from digestion and can handle cooler temperatures. Pigs that are not eating well, perhaps due to disease or poor feed palatability, will feel the cold more. If you have a group of pigs that is off feed, you may need to keep the temperature higher for that group.

Minimum Ventilation in Cold Weather

Minimum ventilation is the amount of air exchange needed to keep the barn dry and remove gases, even when it is cold outside. This is the most important ventilation concept for nursery pig health. Many producers make the mistake of shutting off ventilation to save heat, leading to high humidity and ammonia that damage pig health.

Minimum ventilation must run continuously. You cannot shut it off at night or during cold snaps. The minimum fan should run all the time, with a timer to cycle it if needed. For example, a fan might run for 5 minutes out of every 10 minutes to achieve the desired air exchange rate without over-cooling the barn.

The minimum ventilation rate for nursery pigs is roughly 2 to 3 cubic feet per minute per pig for the first week, increasing to 10 to 15 cubic feet per minute per pig by the end of the nursery period. These are general guidelines. The exact rate depends on pig weight, room size, and outside temperature. Your ventilation system should be designed to provide these rates at minimum fan speed.

A simple way to check if your minimum ventilation is adequate is to monitor relative humidity. If the relative humidity in the barn stays above 70 percent, you are not removing enough moisture. Increase the minimum ventilation rate. If the relative humidity is below 40 percent, you may be over-ventilating and wasting heat.

Another indicator is the smell in the barn. If you can smell ammonia, the ventilation is inadequate. Ammonia should be kept below 10 parts per million at pig level. At higher concentrations, ammonia irritates the respiratory tract and damages the pig's natural defenses against disease. Chronic low level ammonia exposure reduces growth rates even without visible signs of illness.

Air inlet adjustment is critical for minimum ventilation. In cold weather, you want the incoming air to enter near the ceiling and move across the ceiling before dropping to pig level. This gives the cold air time to mix with warm room air. If inlets are open too wide, cold air drops directly onto pigs, creating drafts. If inlets are too small, the air speed will be too high and create drafts. The general rule is to have an inlet opening of about 1 square inch per 4 to 5 cubic feet per minute of fan capacity. You may need to adjust inlets as the outside temperature changes.

Summer Ventilation and Cooling

In warm weather, the ventilation strategy changes. Instead of minimizing airflow, you want to maximize it to remove heat and create a cooling breeze for the pigs. The same fans that provide minimum ventilation in winter will run continuously at higher speeds in summer. You may also have additional fans that only run in warm weather.

For nursery pigs, the target air speed at pig level in summer is 100 to 200 feet per minute. This provides a wind chill effect that helps pigs cope with high temperatures. However, you need to be careful with very young pigs. Pigs in the first week after weaning have limited ability to cope with drafts. If the outside temperature is above 85 degrees, you can use higher air speeds even for young pigs because the air is warm. If the outside temperature is cooler, such as 70 degrees, high air speeds can chill young pigs.

In hot weather, you may also use evaporative cooling systems such as sprinklers, foggers, or evaporative cooling pads. Sprinklers wet the pigs and the floor, and the evaporation cools the pigs. Foggers create a fine mist that cools the air. Evaporative cooling pads cool incoming air before it enters the barn. These systems are most effective in dry climates. In humid climates, evaporative cooling is less effective.

High temperatures also affect feed intake. In summer, pigs may eat less during the hottest part of the day. You can encourage feed intake by feeding during cooler parts of the day, such as early morning and late evening. You can also increase water availability and ensure water is cool. Pigs will drink more in hot weather, so check water flow rates and drinker capacity.

If you use sprinklers or foggers, be careful about excess moisture. High humidity combined with high temperature can make pigs more uncomfortable. Use evaporative cooling only when the temperature is above 80 degrees and the relative humidity is below 70 percent.

Monitoring and Recordkeeping

You cannot manage what you do not measure. A good monitoring system is essential for nursery pig ventilation and temperature control. At a minimum, you should have a thermometer in each room at pig level. Many producers use digital thermometers with probes placed at pig level. You can also use maximum-minimum thermometers to track daily temperature swings.

Automated environmental controllers are common in modern nurseries. These controllers can manage fans, heaters, and inlets based on temperature sensors. They can also alert you if the temperature goes out of a set range. Some systems can be monitored remotely through a computer or smartphone app. These systems are valuable, but they are not a substitute for walking the barn and observing pigs.

Keep a daily record of temperature, humidity, and ventilation settings. Record the high and low temperature for each day, the outside temperature, and any adjustments you made. Also record pig behavior, feed and water intake, and any signs of illness. This record will help you identify patterns and troubleshoot problems.

At least once a week, check the calibration of your thermostats and sensors. A sensor that is off by 2 degrees can cause the system to run at the wrong settings. You can check accuracy by placing a known good thermometer next to the sensor and comparing readings.

Walk the barn at least twice a day, more often in extreme weather. Look at pigs in every pen. Check for piling, panting, or other signs of temperature stress. Check drinkers for flow rate and water quality. Check feed intake and look for signs of scours or respiratory disease. Listen for coughing or other unusual sounds.

Common Mistakes in Nursery Ventilation

Many producers make the same mistakes when managing nursery ventilation. Knowing these common errors can help you avoid them.

The most common mistake is setting the thermostat at human height and trusting that reading. The temperature at pig level can be 5 degrees cooler or warmer than at eye level. Always measure at pig level.

Another common mistake is under-ventilating in cold weather to save on heating costs. This is false economy. The cost of reduced growth and increased disease from poor air quality far exceeds the cost of heating. Pigs in a poorly ventilated barn eat less, convert feed less efficiently, and are more likely to need medication.

Failing to adjust inlets is another common problem. Inlets should be adjusted regularly as the outside temperature changes and as fans cycle on and off. If inlets are set wrong, you get drafts, uneven temperature distribution, and poor air mixing.

Do not ignore the floor temperature. Many producers focus on air temperature and forget that pigs lie on the floor. A cold floor will chill pigs even if the air is warm. Check floor temperature with an infrared thermometer.

Avoid making large temperature adjustments all at once. Sudden changes of 5 degrees or more are stressful to pigs. Make small adjustments and observe the response.

Do not forget about the transition between seasons. In spring and fall, the weather can change dramatically from day to day. Be prepared to adjust ventilation and heating settings as the outside temperature swings.

Troubleshooting Temperature and Air Quality Problems

When pigs show signs of temperature stress or poor air quality, work through a systematic troubleshooting process.

First, check the actual conditions. Measure temperature at pig level in several locations in the room. Check floor temperature. Measure relative humidity and ammonia levels. Compare these readings to your set points.

If the temperature is too low, check the heating system. Is the heater running? Is it producing heat? Are the heat lamps working? Are heat pads warm? Check the thermostat setting and calibration. Check for drafts that might be cooling the room. Inspect the building for air leaks around doors and windows.

If the temperature is too high, check the ventilation system. Are all fans running? Are inlets open enough? Is the controller set correctly? Check for obstructions in air inlets or exhaust fans. Check fan belts and clean fan blades.

If humidity is high, increase minimum ventilation. Check that the minimum fan is running and that the timer is set correctly. Check inlets to ensure air is mixing properly. Look for sources of excess moisture such as leaking drinkers or wet bedding.

If ammonia is high, increase ventilation and check for manure buildup. Ensure that slats are clean and that manure is being removed properly. Check for areas where manure may be trapped. Consider dietary changes to reduce nitrogen excretion, but the immediate fix is more ventilation.

If pigs are piling despite adequate temperature, check for drafts. Use a smoke pencil or incense stick to detect air movement at pig level. A draft from an inlet or door can chill pigs even when the room temperature is correct.

Ventilation System Maintenance

Regular maintenance keeps your ventilation system working efficiently. Develop a maintenance schedule and stick to it.

Clean fan blades and shutters monthly during heavy use periods. Dust buildup on blades reduces fan efficiency significantly. Check belts for wear and tension. Replace worn belts before they break. Lubricate fan motors according to manufacturer instructions.

Clean air inlets regularly. Dust and debris can clog inlets and affect airflow. Check that inlets open and close freely. Repair any damaged or broken inlets.

Check thermostat and controller calibration monthly. Clean sensors with a soft cloth. Ensure sensors are not blocked by dust or cobwebs.

Check heating systems before each use season. Clean burners, check gas lines for leaks, and verify that safety shutoffs work. For electric heaters, check cords for damage and ensure proper grounding.

Inspect heat lamps for damaged cords, loose sockets, and proper mounting. Replace any damaged components immediately. Heat lamps are a fire hazard if not maintained properly. Ensure heat lamps are securely mounted and cannot fall into bedding or manure.

Check heat pads for damage. Look for cracks in the pad surface and damage to cords. Test heat pads to ensure they reach the correct temperature.

When to Call a Veterinarian or Extension Agent

Most ventilation and temperature problems can be solved with careful observation and adjustment. However, there are times when you need professional help.

If pigs are showing signs of respiratory disease such as coughing, labored breathing, or nasal discharge, contact your veterinarian. Poor ventilation can cause or worsen respiratory disease. Your veterinarian can help you determine if disease is present and recommend treatment. They can also help you assess whether your ventilation system is adequate.

If you have high mortality in the nursery, especially from scours or respiratory disease, contact your veterinarian. High mortality indicates a serious problem that needs professional attention. Your veterinarian can help you identify the cause and develop a treatment and prevention plan.

If you cannot maintain target temperature or air quality despite your best efforts, contact your extension agent or a ventilation specialist. They can assess your barn design and equipment and recommend changes. They may also be able to help you calibrate your system or identify design flaws.

If you are planning to build a new nursery or renovate an existing one, consult with an agricultural engineer or extension specialist before you start. Proper ventilation design is essential for nursery pig health. A poorly designed system will cause problems for years. The cost of professional design advice is small compared to the cost of a poorly functioning barn.

Ventilation System Design Considerations

If you are building a new nursery or renovating an existing one, consider these design factors. The ventilation system should be designed to provide the required air exchange rates for the number and size of pigs you plan to house. It should also be designed for your climate and for the building's insulation and sealing characteristics.

Insulation is critical. A well-insulated barn is easier to heat in winter and cool in summer. The ceiling and walls should have adequate insulation for your climate. Poor insulation leads to condensation on walls and ceilings, which increases humidity and can lead to structural damage.

The building should be as airtight as possible, except for the controlled inlets. Air leaks around doors, windows, and wall joints make it impossible to control air distribution. Seal all unintended openings.

The ventilation system should have enough capacity for summer conditions. The total fan capacity should provide about 20 to 30 air changes per hour in summer. This is roughly 20 to 30 cubic feet per minute per pig for nursery pigs. In winter, the minimum ventilation should provide about 2 to 3 cubic feet per minute per pig.

The system should have backup capacity. If a fan fails, other fans should be able to compensate. Consider a backup generator for power outages. A power outage in winter can be deadly for nursery pigs. If you do not have a backup generator, have a plan for emergency ventilation, such as opening doors and windows.

Seasonal Adjustments

Ventilation and temperature management changes with the seasons. Be prepared to adjust your system as the weather changes.

In winter, your focus is on heating and minimum ventilation. The minimum fan runs continuously, and you use heaters to maintain temperature. Inlets are adjusted to direct cold air along the ceiling. Watch for condensation on windows and walls, which indicates high humidity.

In spring and fall, the weather is unpredictable. Temperatures can swing from freezing to warm in a matter of days. You may need to adjust ventilation settings frequently. Use the thermostat to control fans, but be prepared to override the system when weather changes suddenly.

In summer, your focus is on cooling and maximum ventilation. All fans may run continuously. Inlets are opened fully to bring in as much air as possible. You may use evaporative cooling if the climate is dry. Watch for heat stress in pigs, especially in the afternoon.

During extreme weather events, be prepared to take extra measures. During a heat wave, you may need to use sprinklers or reduce feeding during the hottest part of the day. During a cold snap, you may need to add supplemental heat and reduce ventilation to the minimum needed for air quality.

Group Size and Pen Design Considerations

Pen design affects ventilation and temperature control. The number of pigs per pen, the floor type, and the location of feeders and drinkers all influence pig comfort.

Group size in the nursery typically ranges from 10 to 30 pigs per pen, depending on your system. Smaller groups are easier to manage for temperature, as pigs can find a comfortable spot more easily. Larger groups may need more heat sources to provide enough warm floor space.

Solid floored areas with heat pads or brooders should be located away from drafts and inlets. The lying area should be clean and dry. If you use bedding, keep it dry. Wet bedding increases humidity and chills pigs.

Feeders and drinkers should be located in a cooler area of the pen if possible. Pigs are more likely to eat and drink if they are not overheated. However, they should not be in a drafty area that chills them.

Allow enough floor space for pigs to lie down comfortably without piling. The recommended floor space for nursery pigs is 3 to 4 square feet per pig, depending on weight. Overcrowding makes temperature management more difficult because pigs generate more heat and moisture in a smaller space.

Feed and Water Management in Relation to Temperature

Temperature affects feed and water intake. Pigs eat less when they are too hot and may eat less when they are too cold because they spend energy on staying warm instead of eating. Managing feed and water can help pigs cope with temperature stress.

In the first week after weaning, encourage feed intake by providing fresh, palatable feed. Some producers use a gruel or porridge feed for the first few days. Offer small amounts frequently to keep feed fresh. Check feeders daily and remove stale feed.

Water is critical. Pigs need access to clean, fresh water at all times. Check drinker flow rates daily. In the first week, make sure piglets can easily reach the drinker. You may need to adjust drinker height as pigs grow.

In hot weather, pigs drink more. Ensure adequate water supply and consider adding extra drinkers if needed. Cool water is more appealing to pigs. If water lines run through hot areas, consider insulating them or running them underground.

In cold weather, pigs may drink less. Check that water lines do not freeze. Frozen water lines are a common winter problem. Insulate exposed pipes and consider heat tape for critical lines.

Air Quality and Pig Health

Air quality has a direct impact on pig health. Poor air quality damages the respiratory tract and makes pigs more susceptible to disease. The key air quality parameters are ammonia, hydrogen sulfide, carbon dioxide, and dust.

Ammonia is the most common air quality problem in nurseries. It is produced by the breakdown of urea in manure. At levels above 10 parts per million, ammonia irritates the respiratory tract. Pigs exposed to high ammonia have reduced feed intake and growth. They are also more susceptible to respiratory infections. If you can smell ammonia, it is above 10 parts per million.

Hydrogen sulfide is produced by manure decomposition, especially under slatted floors. It has a rotten egg smell. At low levels, it can cause headaches and fatigue in humans. At high levels, it is deadly. Proper ventilation and manure removal keep hydrogen sulfide levels low.

Carbon dioxide is produced by pig respiration and manure. High levels indicate inadequate ventilation. Carbon dioxide levels above 3000 parts per million can reduce pig performance. You can measure carbon dioxide with a portable monitor.

Dust in the nursery comes from feed, dried manure, and skin particles. Dust can carry pathogens and irritate the respiratory tract. Good ventilation removes dust. You can also reduce dust by using pelleted feed, adding fat to the diet, and keeping the barn clean.

Emergency Procedures

Every nursery should have an emergency plan for ventilation and temperature failures. A power outage, fan failure, or heater failure can be life threatening to pigs in a short time.

Post emergency procedures in a visible location. Include phone numbers for the farm manager, the power company, and a repair technician. Identify the location of the main electrical panel and how to shut off power safely.

If the power goes out, open doors and windows to provide natural ventilation. In cold weather, this will let heat escape, but it is better than suffocation. If you have a backup generator, start it immediately. Test the generator regularly to ensure it works.

If a heater fails, move pigs to a warmer area if possible. Add bedding for insulation. Use portable heaters if available. Monitor pigs closely for signs of chilling.

If a fan fails, repair or replace it immediately. If you cannot fix it quickly, open doors and windows to increase ventilation. Move pigs to a different room if the problem cannot be solved quickly.

Have a supply of emergency equipment on hand, including portable heaters, fans, and extension cords. Store these items in a known location and check them regularly.

Frequently Asked Questions

What is the ideal temperature for nursery pigs in the first week after weaning?

The ideal air temperature at pig level is 80 to 82 degrees Fahrenheit for the first week. The floor temperature should be 85 to 90 degrees. You can achieve this with room heating plus localized heat from pads, lamps, or brooders. Watch pig behavior to confirm they are comfortable. Pigs that are spread out and lying on their sides are comfortable. Pigs that are piled up are too cold.

How much ventilation does a nursery pig need?

The minimum ventilation rate for a newly weaned pig is about 2 to 3 cubic feet per minute. This increases as the pig grows, reaching 10 to 15 cubic feet per minute by the end of the nursery period. In summer, you may need 20 to 30 cubic feet per minute per pig for cooling. The key is to run minimum ventilation continuously in cold weather to remove moisture and gases.

Why is my nursery barn humid even though I have ventilation running?

High humidity usually means you are not moving enough air. Check that your minimum fan is running and that the timer is set correctly. Check that air inlets are open enough to allow proper air exchange. Look for sources of excess moisture such as leaking drinkers, wet bedding, or poor drainage. If relative humidity stays above 70 percent, increase ventilation.

How can I tell if my pigs are too cold?

Pigs that are too cold will huddle together and pile on top of each other. They will be vocal and may shiver. Their skin may look pale. Feed intake will be low and they may be sluggish. In the first week, pigs that are cold are at high risk for scours. If you see these signs, increase the temperature and check for drafts.

How can I tell if my pigs are too hot?

Pigs that are too hot will spread out and avoid the warm zone. They will lie on cool surfaces and may pant. They will drink more water and eat less feed. Their skin may appear red. If you see these signs, reduce the temperature and increase ventilation. In extreme heat, use evaporative cooling.

What is a safe level of ammonia in a nursery barn?

Ammonia should be kept below 10 parts per million at pig level. At this level, you should not be able to smell it easily. If you can smell ammonia, it is too high. High ammonia irritates the respiratory tract and makes pigs more susceptible to disease. Increase ventilation and improve manure removal to reduce ammonia.

Should I use heat lamps or heat pads for nursery pigs?

Both can work well. Heat pads provide heat from below, which is very effective and even. They are safer than heat lamps and do not produce light. Heat lamps are less expensive but can be a fire hazard and produce light that may disrupt pig behavior. Many producers use a combination of room heating plus one type of localized heat. Choose the system that works best for your barn and budget.

How often should I check the temperature in my nursery?

Check the temperature at least twice a day, morning and evening. In extreme weather, check more often. Walk the barn and observe pig behavior in every pen. Use a thermometer at pig level. Keep records of temperature, humidity, and any adjustments you make.

Related Farming Guides

This section will be populated with links to related farming guides on pig production, swine health, and barn management. Check back for updates or browse the site for more articles on nursery management, weaning strategies, and swine facility design.

Related Clinical & Scientific Guides

References

National Pork Board: https://www.pork.org/
USDA APHIS Swine Health: https://www.aphis.usda.gov/livestock-poultry-disease/swine
FAO Pig Production: https://www.fao.org/pig-production-and-products/en/
FAO Animal Production and Health: https://www.fao.org/animal-production/en/
WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

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