Nursery Pig Barn Cleaning and Disinfection Between Groups

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

Key Takeaways

• All-in/All-out (AIAO) is paramount for breaking disease cycles: Strict adherence to AIAO, meaning complete emptying and simultaneous repopulation of rooms, prevents continuous pathogen buildup and transmission between age groups. This system is non-negotiable for effective nursery sanitation.
• Mechanical removal of organic matter is the foundational step: Dry cleaning, utilizing scrapers, shovels, and brooms to remove all visible manure, feed, and dust before water application, is critical. Disinfectants are rendered ineffective by organic matter, making this initial step indispensable for subsequent disinfection efficacy.
• Detergent application precedes disinfection to disrupt biofilm: Alkaline or neutral detergents are essential for breaking down biofilm and suspending organic matter, allowing for effective rinsing. Disinfectants cannot penetrate these protective layers, necessitating a two-step cleaning process.
• Disinfectant selection must be pathogen-specific and rotation is key: Choose disinfectants with label claims for target pathogens (e.g., Lawsonia intracellularis, PRRSV, Brachyspira hyodysenteriae) and rotate classes (e.g., quaternary ammonium, oxidizing agents) to prevent resistance and ensure broad-spectrum efficacy.
• Contact time and complete drying are critical for disinfectant efficacy and piglet health: Disinfectants require specific wet contact times (10-30 minutes) to kill pathogens, and surfaces must be thoroughly dried before pig arrival to prevent pathogen reactivation and chilling.
• Verification through visual inspection and environmental sampling (ATP/swabs) is non-negotiable: A surface that appears clean may still harbor pathogens; ATP testing or bacterial swabs are crucial for verifying cleanliness and guiding recleaning if necessary.

Running a nursery barn on all-in all-out production requires a disciplined approach to cleaning and disinfection between groups. This guide covers the complete process from dry cleaning through disinfection and verification, with practical steps for farm owners, herd managers, and crew leads. You will learn how to break disease cycles, reduce antibiotic use, and give each new group of pigs the cleanest possible start.

At a Glance

• All-in all-out is non-negotiable. Do not mix age groups or leave pigs behind when a room is emptied.
• Dry cleaning beats wet cleaning. Remove all organic matter before any water touches surfaces.
• Detergent first, disinfectant second. Disinfectants cannot penetrate manure or biofilm.
• Choose disinfectants by disease risk. Rotate classes to prevent resistance and cover different pathogens.
• Contact time matters. Most disinfectants need 10 to 30 minutes of wet contact to work.
• Verify with visual checks and swabs. If it looks clean but fails a swab test, it is not clean.
• Dry completely before pigs arrive. Moisture reactivates pathogens and harms piglets.
• Keep records for every turnaround. Dates, products, dilutions, temperatures, and verification results guide future decisions.

Why Nursery Barn Sanitation Matters

Nursery pigs are among the most vulnerable animals on a farm. They arrive from sow farms carrying maternal antibody protection that fades quickly. Their immune systems are still developing. They face transport stress, feed changes, and new pen mates all at once. A dirty nursery barn adds pathogen pressure to an already stressed animal.

The financial case for thorough cleaning is direct. Poor sanitation between groups leads to increased mortality, reduced daily gain, and higher medication costs. A single outbreak of swine dysentery or porcine reproductive and respiratory syndrome (PRRS) in a nursery can cost more than the annual labor budget for that barn. When you calculate the cost of a sick group against the cost of a thorough washdown, the washing always wins.

Disease transmission within a nursery barn follows predictable patterns. Fecal-oral pathogens like Lawsonia intracellularis, Brachyspira hyodysenteriae, and Salmonella survive in manure and organic matter. Respiratory pathogens like Mycoplasma hyopneumoniae and influenza virus survive in respiratory secretions and dust. If organic material remains in a corner, under a feeder, or inside a nipple drinker, it can seed the next group.

The all-in all-out system only works when the cleaning step is complete. All-in all-out means every pig in a room or barn enters at the same time and leaves at the same time. The room is then emptied, cleaned, disinfected, and rested before the next group arrives. This breaks the cycle of continuous pathogen buildup that occurs in continuous-flow systems.

Understanding the Disease Cycle You Are Trying to Break

To clean effectively, you need to understand what you are fighting. Pathogens in a nursery barn follow a basic cycle. Infected pigs shed organisms in manure, urine, saliva, and respiratory secretions. These organisms contaminate the environment. The next group of pigs contacts the contaminated environment and becomes infected. The cycle repeats and often worsens with each group.

Different pathogens survive for different lengths of time in the environment. Some are fragile and die quickly outside the host. Others are hardy and can survive for months in organic matter. Knowing which pathogens have been present in your barn helps you choose the right disinfectant and the right protocol.

Bacteria of concern in nursery barns:

• Escherichia coli causes post-weaning diarrhea and edema disease. It survives well in manure and contaminated water.
• Lawsonia intracellularis causes porcine proliferative enteropathy or ileitis. It survives in feces and is difficult to eliminate without thorough cleaning.
• Brachyspira hyodysenteriae causes swine dysentery. It survives in organic matter and is resistant to many common disinfectants.
• Salmonella species cause enteritis and food safety concerns. They survive for weeks in manure and dust.
• Streptococcus suis causes meningitis and arthritis. It survives in dust and organic matter.
• Glaesserella parasuis causes Glasser's disease. It is fragile outside the host but persists in organic material.

Viruses of concern in nursery barns:

• Porcine reproductive and respiratory syndrome virus (PRRSV) survives in organic matter and cold temperatures.
• Porcine epidemic diarrhea virus (PEDV) is highly contagious and survives well in manure slurry.
• Transmissible gastroenteritis virus (TGEV) is similar to PEDV in environmental survival.
• Influenza A virus in swine survives on surfaces for 1 to 2 days but longer in organic matter.
• Porcine circovirus type 2 (PCV2) is very stable in the environment and resistant to many disinfectants.

Parasites of concern:

• Isospora suis causes coccidiosis in young pigs. The oocysts are extremely resistant to disinfectants and require thorough mechanical removal and drying.
• Ascaris suum eggs are also highly resistant and can survive for years in the environment.

The takeaway is that no single disinfectant kills everything. Mechanical cleaning removes the bulk of pathogens. Disinfection handles what remains. Drying and rest time finish the job.

Preparing for the Cleaning Process

Empty the Room Completely

The cleaning process starts before the last pig leaves. Plan the pig flow so that every animal in a room leaves on the same day. Do not hold back runts or slow growers in a dirty room while the rest of the group moves on. Those leftover pigs become a reservoir of infection for the next group.

When the room is empty, walk through and remove all movable equipment. Feeders, drinker lines, partition panels, and creep boards should come out for separate cleaning. This is not optional. Equipment left in place during washing creates shadow areas where organic matter and disinfectant cannot reach.

Protect Yourself and the Environment

Before starting any cleaning work, put on appropriate personal protective equipment. This includes rubber boots, waterproof coveralls, gloves, and eye protection. If you are using high-pressure washing or applying disinfectants, wear a respirator rated for chemical vapors. Many disinfectants release fumes that are harmful when inhaled in enclosed spaces.

Check the manure handling system before washing. If the barn has slatted floors over a pit, determine whether the pit will be emptied before or after washing. In most cases, you should empty the pit before washing so that wash water does not add unnecessary volume. Some operations wash into the pit and pump later. Either way, have a plan for where the wash water goes.

Pre-Soak Considerations

Some operations pre-soak the room before dry cleaning. This is a debated practice. Pre-soaking with water can aerosolize pathogens and spread contamination. It also adds moisture that can make dry cleaning harder. If you pre-soak, use a low-pressure spray and only enough water to moisten heavy manure. Do not use high pressure at this stage.

A better approach in most cases is to start dry. Remove all visible organic matter before any water is applied. This keeps the wash water cleaner and reduces the amount of contaminated liquid you must handle.

Step-by-Step Nursery Barn Cleaning Protocol

Step 1: Dry Clean the Room

Dry cleaning is the most important step in the entire process. The goal is to remove all visible organic matter, dust, and debris from every surface. This includes floors, walls, partitions, feeders, drinkers, and ceilings.

Use scrapers, shovels, and brooms to remove manure and feed from all surfaces. Pay special attention to corners, under feeders, behind drinkers, and along wall-floor junctions. These are the areas where organic matter accumulates and where pigs spend the most time.

Remove dust from horizontal surfaces, ledges, and ventilation equipment. Dust can carry respiratory pathogens and can also shield pathogens from disinfectants. Use a brush or vacuum to remove dust from fans, heaters, and light fixtures.

After dry cleaning, remove all the debris from the room. Do not sweep it into a corner and leave it. The debris must leave the building entirely. Place it in the manure pit, compost pile, or other designated disposal area.

Step 2: Apply Detergent

After dry cleaning, apply a quality alkaline or neutral detergent to all surfaces. Detergents break down the biofilm and grease that protect pathogens. They also help suspend organic matter so that rinsing can remove it.

Choose a detergent labeled for livestock facilities. Many commercial products are available. Alkaline detergents work well on manure and fat. Acid detergents work better on mineral deposits like urine scale. Some operations use a two-step process with both.

Apply the detergent using a foam applicator or low-pressure sprayer. Foam applicators are preferred because the foam clings to vertical surfaces and stays in contact longer. Cover all surfaces including floors, walls, partitions, feeders, and drinkers.

Let the detergent sit for the contact time specified on the label. This is usually 10 to 20 minutes. Do not let the detergent dry on surfaces. If it dries, it can leave a residue that interferes with disinfection.

Step 3: Rinse Thoroughly

Rinse all surfaces with clean water to remove the detergent and suspended organic matter. Use low to medium pressure for this rinse. High pressure can aerosolize pathogens and drive contamination into cracks and pores.

Start at the top of the room and work down. Rinse ceilings, walls, and then floors. This ensures that material rinsed from upper surfaces does not recontaminate lower surfaces that are already clean.

Check all surfaces after rinsing. If you see any remaining organic matter, repeat the detergent and rinse process on those areas. Do not proceed to disinfection until the room is visually clean.

Step 4: Disinfect

Apply disinfectant only to a visually clean surface. Disinfectants are inactivated by organic matter. If you can see dirt, the disinfectant will not work properly.

Choose a disinfectant based on your disease history and the pathogens you are targeting. Common classes include:

• Quaternary ammonium compounds are effective against many bacteria and enveloped viruses. They are not effective against non-enveloped viruses like PCV2 or parvovirus. They work well on clean surfaces and are safe for most equipment.
• Oxidizing agents like hydrogen peroxide and peracetic acid are broad-spectrum and effective against bacteria, viruses, and some spores. They work well on clean surfaces and break down into harmless byproducts.
• Chlorine-based disinfectants are effective against many pathogens but are inactivated by organic matter and corrode metal. They are best used on clean, non-metal surfaces.
• Phenolic compounds are effective against many bacteria and viruses. They are stable and work well in the presence of some organic matter. They can be irritating to skin and eyes.
• Aldehydes like formaldehyde and glutaraldehyde are highly effective but are hazardous to handle and are restricted in some regions. Use them only with appropriate training and equipment.
• Iodophors are effective against many pathogens but are inactivated by organic matter and can stain surfaces.

Check the label for the pathogen claims. The label will list the organisms the product is proven to kill. If your farm has a specific disease concern, choose a product with a label claim for that pathogen.

Apply the disinfectant at the correct dilution. Follow the label instructions exactly. Using too little disinfectant wastes time and money because it will not work. Using too much is also a problem because it can leave toxic residues and increase costs.

Cover all surfaces with the disinfectant solution. Use a low-pressure sprayer or foam applicator. Make sure the solution reaches all cracks, crevices, and hard-to-reach areas.

Allow the disinfectant to remain wet for the contact time specified on the label. This is usually 10 to 30 minutes. If the surface dries before the contact time is reached, reapply the disinfectant. The full contact time is necessary for the product to work.

Step 5: Dry the Room

Drying is an essential step that many operations skip. Moisture is a friend to pathogens. Many bacteria and viruses survive longer in damp environments. A wet room also creates a cold, uncomfortable environment for new pigs.

After disinfection, open all ventilation inlets and outlets. Turn on fans and heaters to move air through the room. If the barn has a forced-air heating system, use it to raise the room temperature and speed drying.

The drying time will depend on the weather, ventilation, and construction of the barn. In warm, dry conditions, a room may dry in 24 to 48 hours. In cold, humid conditions, it may take several days. Do not bring pigs into a room until all surfaces are completely dry.

Step 6: Rest the Room

After drying, leave the room empty for a rest period. This is sometimes called downtime. The rest period allows any remaining pathogens to die from desiccation and exposure to air.

The length of the rest period depends on the disease history of the farm and the pathogens of concern. For routine turnarounds, 3 to 7 days of downtime is common. If the previous group had a disease outbreak, extend the downtime to 10 to 14 days or longer.

Use the rest period to complete any repairs. Fix broken feeders, drinkers, and ventilation equipment. Replace worn partition panels. Paint or seal surfaces that are difficult to clean. This is also the time to check rodent and insect control measures.

Disinfectant Selection and Rotation

Choosing the right disinfectant is not a one-time decision. The best approach is to rotate between disinfectant classes based on the disease history of the farm and the season.

Rotation prevents pathogens from developing resistance to a single product. It also ensures that you have coverage for a broader range of organisms. For example, you might use an oxidizing agent for one turnaround and a quaternary ammonium compound for the next.

Consider the following factors when selecting a disinfectant:

Disease history. If the previous group had a specific disease, choose a product with proven efficacy against that pathogen. For example, if you had a swine dysentery outbreak, choose a product effective against Brachyspira hyodysenteriae.

Water hardness. Some disinfectants are inactivated by hard water. Check the label for water hardness recommendations. You may need to soften the water or use a product that works in hard water.

Temperature. Most disinfectants work best at temperatures above 60 degrees Fahrenheit. In cold weather, you may need to warm the water or choose a product that works at lower temperatures.

Surface compatibility. Some disinfectants corrode metal or damage rubber. Check the label for compatibility with the surfaces in your barn.

Safety. Consider the safety of your workers. Some disinfectants require respirators and protective clothing. Choose products that your crew can use safely.

Cost. The cost per gallon of diluted solution varies widely between products. Consider the cost per square foot of coverage, not just the cost per gallon of concentrate.

Common Mistakes in Nursery Barn Cleaning

Mistake 1: Skipping Dry Cleaning

The most common and most costly mistake is going straight to high-pressure washing without dry cleaning. High-pressure water drives organic matter into cracks and pores. It also creates aerosols that spread pathogens throughout the room and into adjacent areas.

Dry cleaning is not glamorous work, but it is the foundation of the entire process. If you skip this step, nothing else matters.

Mistake 2: Using High Pressure Too Early

High-pressure washing has its place in the final rinse, but it should not be used for the initial cleaning. High pressure at the start of the process aerosolizes pathogens and drives them into surfaces.

Use low pressure for the detergent application and initial rinse. Reserve high pressure for the final rinse on hard, non-porous surfaces.

Mistake 3: Applying Disinfectant to Dirty Surfaces

Disinfectants are not cleaners. They cannot penetrate organic matter. If you apply disinfectant to a surface with visible dirt, the disinfectant is wasted.

The rule is simple. If you can see dirt, the surface is not ready for disinfectant. Clean it again.

Mistake 4: Using the Wrong Dilution

More is not better when it comes to disinfectants. Using too much concentrate wastes money and can leave toxic residues. Using too little means the product will not work.

Always measure the disinfectant and water accurately. Use a measuring cup or scale. Do not guess. Check the label for the correct dilution rate and contact time.

Mistake 5: Ignoring Contact Time

Many operations spray disinfectant and then immediately rinse or dry the room. This does not work. Disinfectants need time to kill pathogens.

Read the label for the required contact time. This is usually 10 to 30 minutes. Make sure the surface stays wet for the full contact time. If it dries too quickly, reapply.

Mistake 6: Forgetting Hard-to-Reach Areas

Pathogens hide in cracks, crevices, and under equipment. If you only clean the visible surfaces, you are leaving a reservoir of infection.

Pay special attention to:

• Wall-floor junctions
• Corners
• Under feeders and drinkers
• Inside nipple drinkers
• Behind partition panels
• Around ventilation inlets and outlets
• On top of light fixtures and ledges

Mistake 7: Bringing Pigs into a Wet Room

A wet room is a cold room. Newly weaned pigs need warmth. A damp environment also promotes pathogen survival.

Wait until all surfaces are completely dry before bringing in pigs. If you are in a hurry, use heaters and fans to speed the drying process.

Mistake 8: Not Checking the Work

Visual inspection is not enough. A surface can look clean and still harbor pathogens. Use ATP bioluminescence tests or bacterial swabs to verify cleanliness.

If you do not have access to testing equipment, at least do a thorough visual inspection with a flashlight. Look for any sign of organic matter, especially in corners and under equipment.

Mistake 9: Recontaminating the Room

A clean room can be recontaminated in many ways. Dirty boots, equipment, and tools can bring pathogens back in. Rodents and insects can carry disease. Even the air can carry pathogens from adjacent rooms.

Use footbaths at the entrance to clean rooms. Change boots and coveralls between rooms. Keep doors closed. Control rodents and insects throughout the barn.

Mistake 10: Inconsistent Protocols

If every crew member does the cleaning differently, you will get inconsistent results. Write down your cleaning protocol and train all workers on the exact steps.

Include details like which products to use, what dilution rates, how long to let products sit, and what order to work through the room. Post the protocol in the barn and review it regularly.

Decision Thresholds for Deep Cleaning

Not every turnaround requires the same level of cleaning. You should adjust your protocol based on the health status of the previous group and the risk to the next group.

Routine Turnaround

For a group that was healthy and weaned normally, use the standard protocol:

1. Dry clean
2. Detergent
3. Rinse
4. Disinfect
5. Dry
6. Rest 3 to 7 days

This protocol should be followed for every group, without exception.

High-Risk Turnaround

If the previous group had any of the following, upgrade to a deep cleaning protocol:

• Mortality above 5 percent
• Diarrhea outbreaks
• Respiratory disease
• Streptococcus suis infections
• Any diagnosis of a notifiable disease

For a deep cleaning:

1. Dry clean
2. Apply degreaser and allow extended contact time
3. Rinse
4. Apply acid detergent to remove mineral scale
5. Rinse
6. Disinfect with a broad-spectrum product
7. Disinfect a second time with a different class of product
8. Dry
9. Rest 10 to 14 days
10. Consider environmental sampling before repopulation

Disease Eradication Turnaround

If the barn is being depopulated for disease eradication, such as PRRS or swine dysentery elimination, use the most aggressive protocol:

1. Remove all equipment from the room
2. Dry clean
3. Degrease and rinse
4. Acid wash and rinse
5. Disinfect with an oxidizing agent
6. Disinfect with a different class of product
7. Fumigate if approved and available
8. Dry
9. Rest 14 to 21 days
10. Sample the environment and confirm negative before repopulation

Decision Guide

Use the following questions to determine your cleaning level:

• Did the previous group have diarrhea? If yes, use a deep cleaning protocol.
• Was mortality above 5 percent? If yes, use a deep cleaning protocol.
• Was there a diagnosis of a disease that survives well in the environment? If yes, use a deep cleaning protocol.
• Are you bringing in pigs from a new source? If yes, use a deep cleaning protocol.
• Has it been more than 6 months since the last deep cleaning? If yes, schedule one.

Monitoring and Recordkeeping

You cannot manage what you do not measure. A cleaning and disinfection program needs verification and records to be effective.

Visual Inspection

After cleaning and before disinfection, inspect the room with a flashlight. Look for any visible organic matter. Check corners, under equipment, and along wall-floor junctions. If you find any dirt, clean that area again.

ATP Testing

Adenosine triphosphate (ATP) testing measures organic residue on surfaces. ATP is present in all living cells, so a high reading indicates organic contamination. ATP tests are quick and simple. Swab a surface, insert the swab into the reader, and get a result in seconds.

ATP readings are measured in relative light units (RLU). Each test kit has its own threshold for clean. In general, readings below 100 RLU indicate a clean surface. Readings above 300 RLU indicate a dirty surface that needs recleaning.

Test the same surfaces every time so you can compare results between turnarounds. Good test locations include:

• Feeder trough
• Drinkers
• Floor in the center of a pen
• Wall-floor junction
• Partition panel

Bacterial Swabs

For a more definitive test, use bacterial swabs. These are sent to a laboratory for culture. The lab reports the number and type of bacteria present. This is more expensive than ATP testing and takes longer, but it gives you specific information about pathogen levels.

Bacterial swabs are especially useful after a disease outbreak. They can tell you whether the environment is still contaminated with the pathogen of concern. Work with your veterinarian to interpret the results.

Recordkeeping

Keep a cleaning log for every room and every turnaround. The log should include:

• Date of cleaning
• Room or barn identification
• Group number and pig source
• Health status of the previous group
• Cleaning crew names
• Products used and dilution rates
• Water temperature
• Contact times
• Drying time
• Rest time
• Verification results (ATP, swabs, visual inspection)
• Any problems encountered

Review the logs regularly to identify trends. If one room consistently fails ATP testing, investigate why. If mortality is higher in one room, compare the cleaning records to other rooms.

Equipment and Supplies Checklist

Having the right tools makes the job easier and more effective. Assemble the following equipment before you start:

• Scrapers and shovels for dry cleaning
• Heavy-duty brooms and brushes
• High-pressure washer with adjustable pressure
• Foam applicator for detergent and disinfectant
• Low-pressure sprayer
• Measuring cups and scales for accurate dilution
• Buckets and mixing containers
• Personal protective equipment including boots, coveralls, gloves, eye protection, and respirator
• Flashlight for inspection
• ATP testing equipment
• Swabs for bacterial testing
• Cleaning log and pens

Keep this equipment stored in a dedicated area. Do not use cleaning equipment for other purposes. Clean and maintain the equipment after each use.

Sanitation of Specific Areas

Floors

Floors receive the most contamination and are the most important surface to clean. Solid concrete floors require more effort than slatted floors because manure accumulates on the surface.

For solid floors, pay special attention to cracks and pores in the concrete. These can harbor pathogens that are difficult to remove. Seal cracks and resurface damaged concrete when possible.

For slatted floors, clean both the top surface and the sides of the slats. Manure accumulates between slats and is often missed during cleaning. Remove slats if they are removable and clean them separately.

Walls and Partitions

Walls and partitions are often overlooked because they do not appear dirty. However, they can harbor respiratory pathogens in dust and organic matter.

Clean walls from top to bottom. Pay special attention to the bottom 2 feet of walls, where pigs rub and splash manure. Partition panels should be removed and cleaned on both sides.

Feeders

Feeders are a major source of contamination. Feed residue supports bacterial growth and can spread disease.

Remove all feed from feeders. Disassemble feeders if possible to clean all parts. Pay special attention to corners and seams where feed accumulates. After cleaning and disinfection, allow feeders to dry completely before reassembling.

Drinkers

Nipple drinkers and cup drinkers are difficult to clean but essential. Biofilm can build up inside drinker lines and harbor pathogens.

Flush drinker lines with clean water. Use a brush to clean the inside of cups. Remove and soak nipples in disinfectant solution. Rinse thoroughly before reattaching.

Ventilation Equipment

Fans, inlets, and heaters accumulate dust that can carry respiratory pathogens. Clean these components carefully.

Turn off power before cleaning electrical equipment. Use a vacuum or brush to remove dust from fan blades, shutters, and inlet panels. Wipe down surfaces with disinfectant where safe. Check that all ventilation equipment operates properly before bringing in pigs.

Ceilings and Ledges

Dust accumulates on ceilings, beams, and ledges. This dust can harbor respiratory pathogens and can fall onto pigs below.

Clean ceilings and ledges with a brush or vacuum. This is easiest to do before washing walls and floors, so the dust falls onto surfaces that will be cleaned next.

Drying and Heating Strategies

Drying is a critical step that is often rushed. A wet room is an invitation for disease. Pathogens survive longer in moisture, and pigs are more susceptible to chilling when they arrive.

Use Heat

Raise the room temperature to speed drying. For nursery barns, aim for a room temperature of 80 to 85 degrees Fahrenheit during the drying period. This is warmer than the temperature needed for the pigs, but it speeds evaporation.

Use forced-air heaters if available. Circulate air with fans to move moisture out of the room. Open inlets and outlets to allow humid air to escape.

Use Dehumidifiers

In humid climates, dehumidifiers can speed drying. They remove moisture from the air, allowing surfaces to dry faster. Portable dehumidifiers are available for this purpose.

Check All Surfaces

Do not assume the room is dry because the floor feels dry. Check walls, partitions, feeders, and drinkers. Look for condensation on windows and metal surfaces. Check corners and under equipment.

The Paper Towel Test

A simple test for dryness is to press a paper towel against the surface. If the towel picks up moisture, the surface is not dry. Wait longer or add more heat and airflow.

Biosecurity During the Cleaning Process

Cleaning and disinfection are part of a larger biosecurity program. The cleaning process itself can spread pathogens if not managed carefully.

Clean in the Right Order

Clean rooms in order from cleanest to dirtiest. If you have multiple rooms in a barn, clean the rooms farthest from the entrance first. Work toward the entrance so that you do not walk through clean rooms with dirty boots.

Control Traffic

Keep the cleaning crew separate from the animal care crew. Do not allow people to move between dirty and clean rooms without changing boots and coveralls.

Use footbaths at room entrances. Change footbath solution daily. Footbaths are not a substitute for changing boots, but they add a layer of protection.

Manage Wash Water

Wash water contains high concentrations of pathogens. Do not let it run into clean areas. Direct wash water to the manure pit or other designated collection point.

If you are washing a room with a pit underneath, be aware that washing can create aerosols that spread pathogens through the pit. Close pit covers and ventilate the room during washing.

Control Rodents and Insects

Rodents and flies can carry pathogens from dirty areas to clean areas. Check for signs of rodent activity during the cleaning process. Set baits and traps. Repair holes and gaps in walls and doors.

Flies are especially problematic in warm weather. Use fly control measures including baits, traps, and insecticides. Remove manure and organic matter that attracts flies.

When to Call a Veterinarian or Extension Agent

Most cleaning and disinfection work can be handled by farm staff. However, there are situations where you should seek professional help.

Call Your Veterinarian When:

• The previous group had a disease outbreak and you are not sure which disinfectant to use
• Mortality in the previous group was above 5 percent and you need help investigating the cause
• You are planning to repopulate a barn after disease eradication and need guidance on environmental testing
• You are seeing disease in the current group that may be linked to inadequate cleaning
• You need help interpreting environmental sampling results
• You are considering changes to your cleaning protocol and want expert input

Call Your Extension Agent When:

• You want to compare your cleaning protocol to current best practices
• You need help setting up an environmental monitoring program
• You are building or remodeling a nursery barn and want advice on materials and design for cleanability
• You want training materials for your cleaning crew
• You have questions about disinfectant selection or rotation
• You are considering changes to your pig flow or all-in all-out management

Call a Regulatory Veterinarian When:

• You suspect a notifiable disease such as African swine fever, classical swine fever, or foot-and-mouth disease
• You see unusual signs or high mortality and are not sure of the cause
• You are planning to move pigs across state or international borders and need health certification

Training Your Cleaning Crew

The best protocol in the world is useless if the crew does not follow it. Training is an ongoing process, not a one-time event.

Initial Training

Every new crew member should receive hands-on training in the cleaning protocol. Show them each step, explain why it matters, and then watch them do it. Correct mistakes immediately.

Written Protocols

Post the cleaning protocol in a visible location in the barn. Include product names, dilution rates, contact times, and safety precautions. Make sure every crew member knows where the protocol is posted.

Regular Refreshers

Hold a refresher training session at least twice a year. Use this time to review the protocol, discuss any problems, and introduce new products or equipment.

Accountability

Assign responsibility for each room to a specific person. That person signs the cleaning log when the room is complete. The herd manager or owner should spot-check rooms after cleaning and verify the log.

Building Design for Cleanability

If you are building a new nursery barn or remodeling an existing one, consider design features that make cleaning easier.

Smooth Surfaces

Choose smooth, non-porous materials for floors, walls, and partitions. Sealed concrete, epoxy-coated floors, and plastic or stainless steel partitions are easier to clean than rough concrete or wood.

Rounded Corners

Coves at the wall-floor junction eliminate the sharp corners where organic matter accumulates. Rounded corners are easier to clean and do not trap debris.

Adequate Drainage

Floors should slope toward drains so that wash water flows away quickly. Drains should be large enough to handle the volume of water from washing.

Removable Equipment

Design feeders, drinkers, and partitions to be easily removable. This allows thorough cleaning of all surfaces and reduces shadow areas.

Good Lighting

Adequate lighting is essential for inspecting cleanliness. Install bright lights that illuminate all areas of the room, including corners and under equipment.

Ventilation Control

The ventilation system should be able to move large volumes of air for drying. Consider adding supplemental heaters and fans for the drying phase.

Environmental Sampling and Verification

Environmental sampling tells you whether your cleaning and disinfection program is working. There are several methods available.

Visual Inspection

The simplest method is a thorough visual inspection with a flashlight. Look for any sign of organic matter. This should be done after cleaning and before disinfection.

ATP Bioluminescence

ATP testing measures organic residue on surfaces. It is quick and provides immediate results. The test works by swabbing a surface and inserting the swab into a reader that measures light output.

ATP testing is a good screening tool because it detects all organic matter, not just pathogens. If the surface is clean of organic matter, pathogens are unlikely to survive.

Bacterial Culture

Bacterial culture involves swabbing surfaces and sending the samples to a laboratory. The lab cultures the samples and reports the types and numbers of bacteria present.

Culture results take 2 to 5 days to arrive. This means you cannot use culture results before bringing in the next group. However, culture results are valuable for evaluating your protocol over time.

Polymerase Chain Reaction (PCR)

PCR testing detects the genetic material of specific pathogens. It is more sensitive than culture and can detect pathogens that are difficult to culture.

PCR testing is expensive and requires a laboratory. It is most useful when you are trying to eliminate a specific disease and need to confirm the environment is free of that pathogen.

Sampling Locations

Sample the same locations each time for consistent results. Good locations include:

• Feeder trough
• Nipple drinker
• Floor in the center of a pen
• Wall-floor junction
• Partition panel
• Ventilation inlet

Sampling Timing

Sample after cleaning and disinfection, just before the room is dried. This tells you whether the disinfection step worked. You can also sample after drying to see if pathogens survive the drying process.

Cost Considerations

Cleaning and disinfection costs money in labor, products, and utilities. These costs are easy to measure. The benefits are harder to measure because they appear as avoided losses.

Labor Costs

Labor is the largest cost of cleaning. A thorough cleaning of a nursery room can take 4 to 8 hours depending on the size of the room and the condition it is in. Multiply this by your labor rate to estimate the cost per room.

Product Costs

Detergents and disinfectants cost money. The cost per room depends on the products used and the dilution rates. Broad-spectrum disinfectants are more expensive per gallon but may save money by preventing disease.

Utility Costs

Heating for drying and hot water for washing add to utility bills. These costs vary by season and location.

Comparing Costs to Benefits

The cost of cleaning a room is typically much less than the cost of treating disease in a group of pigs. A single outbreak of ileitis or swine dysentery can cost more in medication and lost performance than an entire year of cleaning supplies.

Track your cleaning costs and your disease costs. This helps you make informed decisions about how much to invest in cleaning.

Frequently Asked Questions

How long should a nursery barn sit empty between groups?

A minimum of 3 to 7 days of downtime is standard for routine turnarounds. This includes time for drying and rest after cleaning and disinfection. If the previous group had a disease outbreak, extend the downtime to 10 to 14 days or longer. The exact length depends on the pathogen involved and the effectiveness of your cleaning. Longer downtime always reduces pathogen load, but it also reduces barn utilization. Work with your veterinarian to determine the right downtime for your situation.

Can I use the same disinfectant for every turnaround?

You can, but rotation is better. Using the same disinfectant repeatedly can allow pathogens to develop resistance. Different disinfectant classes work through different mechanisms, so rotating between classes provides broader coverage. For example, alternate between an oxidizing agent and a quaternary ammonium compound. Choose products that are effective against the pathogens that have been present on your farm.

What is the best disinfectant for porcine epidemic diarrhea virus?

PEDV is an enveloped virus that is relatively easy to inactivate with most disinfectants. Look for products with label claims against coronaviruses. Oxidizing agents like accelerated hydrogen peroxide and peracetic acid are effective. Quaternary ammonium compounds with good label claims also work. The key is thorough cleaning first. PEDV is present in high concentrations in manure, and organic matter will inactivate any disinfectant.

How do I know if my cleaning is working?

Use multiple verification methods. Start with a visual inspection using a flashlight. Then use ATP testing to measure organic residue on surfaces. For a higher level of assurance, use bacterial swabs sent to a laboratory. Keep records of all verification results so you can track trends over time. If you see disease in a group despite good cleaning records, investigate the cleaning process for gaps.

Do I need to clean the manure pit under slatted floors?

Yes, the pit should be emptied and cleaned as part of the turnaround. If the pit is not emptied, pathogens in the slurry can recontaminate the room through gases and aerosols. Empty the pit before washing the room so that wash water does not add unnecessary volume. After emptying, use a pit additive or lime to reduce pathogen levels in any remaining residue.

How does water temperature affect disinfection?

Most disinfectants work better at warmer temperatures. The ideal temperature range is usually 60 to 100 degrees Fahrenheit. Cold water slows the chemical reactions that kill pathogens. If you are cleaning in cold weather, use hot water for mixing disinfectants. Check the label for temperature requirements and do not use products below their minimum effective temperature.

Should I use a footbath at the entrance to a clean room?

Yes, but understand the limitations. A footbath is only effective if the solution is fresh and boots are clean before entering. Scrub boots to remove organic matter before stepping into the footbath. Change the footbath solution daily or more often if it becomes dirty. The best practice is to change boots between rooms and use the footbath as an additional layer of protection.

What personal protective equipment do I need for cleaning and disinfection?

At minimum, wear rubber boots, waterproof coveralls, gloves, and eye protection. When applying disinfectants in enclosed spaces, wear a respirator rated for chemical vapors. Some disinfectants release fumes that can irritate the lungs. Read the safety data sheet for each product and follow the recommended precautions. Do not mix disinfectants together unless the label specifically allows it. Mixing can create toxic gases.

Related Farming Guides

This section will be populated with links to related farming guides covering swine production, biosecurity, and disease prevention topics.

Related Clinical & Scientific Guides

• Pig Enrichment Programs and Behavior Monitoring
• Swine Handling Facility Design for Safe Pig Movement
• Swine Feeding Management for Grow-Finish Pigs

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.