Artificial Insemination in Pigs: Timing, Semen Handling, and Success Rates

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

Key Takeaways

• Optimal insemination timing is paramount, directly correlating with sperm viability (24-48 hours) and oocyte viability (8-12 hours post-ovulation). For most sows, insemination should occur approximately 12 and 24 hours after the initial detection of standing estrus, while gilts often require a third insemination at 36 hours to maximize conception.
• Semen handling protocols are critical for preserving sperm viability, with extended semen requiring storage at 60-65°F and use within 3-5 days. Temperatures below 55°F cause cold shock, and semen must be warmed to 95-100°F prior to insemination, avoiding rough handling which damages sperm tails.
• Accurate heat detection, primarily confirmed by the standing reflex in response to boar presence and back pressure, is the foundational element of successful AI. Relying solely on secondary signs like vulvar swelling or restlessness leads to mistimed inseminations and reduced conception rates.
• Catheter placement within the cervix is essential for semen retention; failure to achieve a secure lock results in semen pooling in the vagina and subsequent loss. Foam-tip and spiral-tip catheters are designed to engage cervical folds, with spiral tips often preferred for gilts or sows with relaxed cervices.
• Performance monitoring through key metrics such as conception rate (<80% triggers investigation), litter size (drop >1 piglet warrants review), and wean-to-estrus interval (<7 days average) is crucial for identifying and rectifying program deficiencies. Consistent recordkeeping of insemination details, technician performance, and boar fertility is vital for troubleshooting.
• Biosecurity is enhanced by AI through reduced boar introduction, but semen can transmit pathogens; therefore, sourcing from suppliers with rigorous disease surveillance and implementing strict on-farm hygiene (single-use catheters, handwashing) are imperative.

Artificial insemination in pigs is one of the most effective tools a swine producer can adopt to improve genetics, reduce disease transmission risk, and tighten farrowing schedules. This guide covers the full process from heat detection and timing through semen handling, insemination technique, and recordkeeping. It is written for commercial swine farm managers, breeding herd technicians, and small-scale producers who want to move beyond natural mating or improve their current AI results.

At a Glance

• Heat detection is the foundation. Most AI failures trace back to poor timing, not poor semen.
• Semen is perishable. Store extended semen at 60 to 65 degrees Fahrenheit and use it within 3 to 5 days of collection for best fertility.
• Timing matters more than frequency. For most sows, inseminate twice at 12 and 24 hours after standing heat is first detected. Gilts often need a third insemination.
• Check the cervix. The insemination rod must lock into the cervix. If it does not, the semen will pool in the vagina and be lost.
• Minimize stress. Handle sows calmly and keep them in familiar surroundings during breeding.
• Track everything. Conception rate, litter size, and wean-to-estrus interval are the numbers that tell you if your AI program is working.
• Call for help early. If conception rates drop below 80 percent or litter size falls by more than one piglet per litter, investigate before the problem spreads through the herd.

Understanding the Sow Reproductive Cycle

To succeed with artificial insemination in pigs, you must understand the reproductive cycle of the sow. The average estrous cycle lasts 21 days, with a normal range of 18 to 24 days. Estrus itself, the period when the sow is receptive to the boar and will stand for mating, lasts 40 to 60 hours in most sows. Ovulation occurs at roughly two-thirds to three-quarters of the way through standing estrus.

This timing creates a practical problem. Sperm cells can survive in the female reproductive tract for about 24 to 48 hours, but they need time to capacitate before they can fertilize the egg. The egg itself remains viable for only about 8 to 12 hours after ovulation. If you inseminate too early, the sperm may die before the egg is released. If you inseminate too late, the egg may no longer be viable. The goal is to have a population of capacitated, motile sperm waiting in the oviduct when ovulation occurs.

For most sows, this means the first insemination should happen late on the first day of standing estrus or early on the second day. The second insemination follows 12 to 24 hours later. This approach covers the window of ovulation for the majority of females.

Heat Detection: The First Step to AI Success

You cannot time artificial insemination without reliable heat detection. The standing reflex is the only reliable sign that a sow or gilt is in true estrus and ready for breeding. Other signs such as a red and swollen vulva, restlessness, mounting other pen mates, and a stringy mucus discharge are useful supporting clues, but they are not definitive.

Using a Boar for Heat Detection

The most effective heat detection uses a mature boar with high libido. The boar should be housed near the sow pens so the sows can see, smell, and hear him. For daily detection, move the sows to the boar or bring the boar to the sow pen. Do not allow direct contact unless you are ready for the boar to mount. The goal is nose-to-nose contact through a barrier or fence line.

When you apply back pressure to a sow in standing estrus, she will arch her back, prick up her ears, and stand immobile. This is the standing reflex. It is the only sign that reliably indicates the sow will accept mating.

Heat Detection Schedule

Check sows for estrus twice daily, ideally 12 hours apart. In the morning and again in the late afternoon or early evening. Each check should take at least 3 to 5 minutes per pen. Rushing heat detection is a common cause of missed estrus and poor AI timing.

For weaned sows, estrus typically appears 4 to 6 days after weaning. Gilts may show their first estrus at any time, but many producers breed gilts on their second or third observed estrus to allow for more maturity and larger litters.

Heat Detection in Gilts

Gilts are often more difficult to detect in heat than sows. They may show a weaker standing reflex and shorter estrus duration. Use a mature boar for gilt heat detection and be patient. If you are group-housing gilts, watch for mounting behavior among pen mates. A gilt that stands to be mounted by another gilt is often in estrus, but confirm with back pressure and boar exposure before breeding.

Semen Handling: Protecting the Most Valuable Input

Semen is the most sensitive input in the AI process. Poor handling can destroy fertility in minutes, even when the semen was excellent at collection. Follow these rules without exception.

Temperature Control

Extended boar semen is stored at 60 to 65 degrees Fahrenheit. This is cooler than room temperature but not refrigerated. Most commercial semen suppliers ship in insulated boxes with temperature stabilizers. When the semen arrives, check the temperature immediately. It should be close to 60 to 65 degrees.

Do not refrigerate boar semen. Temperatures below 55 degrees can cause cold shock, which damages the sperm cell membranes and kills fertility. Do not freeze it. Do not leave it in direct sunlight or in a hot truck. Do not store it on top of a warm incubator or near a heater.

When you are ready to inseminate, warm the semen to about 95 to 100 degrees Fahrenheit. Place the semen bottle in a warm water bath at 95 to 100 degrees for 15 to 20 minutes. Do not use hot water. Do not microwave the semen. Do not leave the bottle in the warm water bath for more than 30 minutes, as prolonged warming reduces sperm lifespan.

Gentle Handling

Sperm are fragile. Handle semen bottles gently at all times. Do not shake them, drop them, or squeeze them hard. When you invert the bottle to mix the semen, do so slowly and gently. Rough handling damages the sperm tails and reduces motility.

Check Motility

Before you use any semen, check it under a microscope. This is the single best quality check you can do on farm. Place a small drop of semen on a warmed glass slide, cover with a coverslip, and examine at 100 to 400x magnification. You should see dense waves of sperm moving actively across the field. At least 70 percent of sperm should show progressive forward motility.

If motility is poor, below 50 percent, or if many sperm are dead or sluggish, do not use that dose. Discard it and contact your semen supplier. A single poor-quality dose can cost you an entire litter.

Storage Duration

Use extended semen within 3 to 5 days of collection. Fertility declines with each day of storage. Many commercial suppliers guarantee fertility for 3 days, with acceptable but declining fertility through day 5. If you receive semen that has been in transit for 2 days, use it within the next 1 to 3 days.

Do not mix semen from different boars in one bottle unless you have a specific reason and the supplier has prepared a mixed-dose product. Mixing can trigger sperm agglutination, where sperm clump together and lose motility.

What to Do With a Damaged Dose

If you suspect a semen dose has been mishandled, do not use it. The cost of one semen dose is trivial compared to the cost of a missed estrus cycle, which adds 18 to 24 days to the farrowing interval and costs you feed, labor, and facility time. When in doubt, throw it out and order a replacement.

Choosing the Right Insemination Equipment

The standard equipment for artificial insemination in pigs is the disposable foam-tip catheter or the spiral-tip catheter. Both are designed to lock into the cervix and deposit semen directly into the cervix or uterus.

Foam-Tip Catheters

Foam-tip catheters are the most common and easiest to use. The foam tip is soft and compressible. It is inserted through the vagina until it reaches the cervix, then pushed gently to seat the foam in the cervical folds. The foam creates a seal that holds the semen in place.

Foam-tip catheters are well suited for sows. They are less effective in gilts, which have a smaller cervix. For gilts, use a smaller foam-tip catheter designed for gilts or switch to a spiral-tip catheter.

Spiral-Tip Catheters

Spiral-tip catheters have a rigid spiral tip that is rotated counterclockwise to thread into the cervical folds. They provide a firmer lock and are often preferred for gilts and for sows with a relaxed cervix. The rotation must be gentle. Never force the catheter. If you meet resistance, withdraw slightly and try again.

Post-Cervical Insemination

Post-cervical insemination, also called intrauterine insemination, uses a special catheter that passes through the cervix and deposits semen directly into the uterine body. This technique allows reduced sperm numbers per dose, which is valuable when using sexed semen or high-value genetics.

Post-cervical insemination requires more skill and is not appropriate for all sows. It is generally used only in sows that have farrowed at least once. The cervix must be fully relaxed, which usually means the sow is well into standing estrus. If you are new to post-cervical insemination, practice with conventional catheters first and train with an experienced technician.

The Insemination Procedure Step by Step

Follow this procedure for every insemination. Consistency is the key to repeatable success.

Step 1: Prepare the Sow

Move the sow to a clean, dry breeding area or inseminate her in her home pen. Many producers prefer to inseminate in the home pen to reduce stress. The floor should be non-slip and clean. The sow should be calm and not distracted by feed or other pigs.

If you are using a boar for stimulation, bring the boar to the front of the sow and allow nose-to-nose contact through a barrier. Do not let the boar mount the sow during AI, as this can dislodge the catheter.

Step 2: Clean the Vulva

Wipe the sow's vulva with a clean paper towel or a single-use disinfectant wipe. Remove any manure or debris. This step reduces the risk of introducing bacteria into the reproductive tract. Do not use soap or harsh disinfectants on the vulva, as these can irritate the tissue.

Step 3: Prepare the Semen

Remove the semen bottle from storage and warm it as described above. Gently invert the bottle several times to resuspend the sperm. Do not shake. Remove the cap and attach the insemination catheter according to the manufacturer's instructions.

Step 4: Insert the Catheter

Lubricate the tip of the catheter with a small amount of sterile lubricant. Some catheters come pre-lubricated. Separate the sow's vulva with one hand and insert the catheter at a slight upward angle to avoid the urethral opening. Push the catheter gently forward and slightly upward until you feel resistance at the cervix.

For a foam-tip catheter, push the foam tip firmly against the cervix and apply steady, gentle pressure to seat it. For a spiral-tip catheter, rotate the catheter counterclockwise while applying gentle forward pressure until it locks into the cervical folds.

You will know the catheter is seated when you feel a distinct catch or lock. If the catheter does not lock, the semen will not be retained. Withdraw and try again.

Step 5: Deposit the Semen

Attach the semen bottle to the catheter and raise it so the semen flows by gravity. Do not squeeze the bottle. The semen should flow slowly over 3 to 5 minutes. If the flow stops, gently rotate or lift the catheter slightly to reposition it. Do not force the semen.

If the semen flows back out around the catheter, the seal is not adequate. Withdraw the catheter, check the tip for proper placement, and start again with a fresh dose if necessary.

Step 6: Remove the Catheter

After the semen has flowed in, pinch the catheter to prevent air from entering the uterus, then gently withdraw it. Some producers leave the catheter in place for 1 to 2 minutes to allow the uterus to draw in the semen. This is not necessary but does no harm.

Step 7: Record the Insemination

Record the sow or gilt identification, the date and time of insemination, the boar or semen lot number, and the technician's initials. This record is essential for evaluating AI success and identifying problems.

Timing the Insemination Correctly

The single most common cause of low conception rates with artificial insemination in pigs is poor timing. Here is a practical schedule that works for most operations.

Weaned Sows

Check weaned sows for estrus starting 3 days after weaning. Most sows come into heat 4 to 6 days after weaning. When you first observe standing estrus, note the time.

For most sows, inseminate the first time approximately 24 hours after you first observe standing estrus. Inseminate a second time 12 to 24 hours later. This two-dose schedule covers the ovulation window for the majority of sows.

Some producers use a single insemination for sows with a strong, clear estrus and a known ovulation pattern. This works on well-managed farms with consistent genetics, but it requires excellent heat detection and good records. For most operations, two inseminations give better results with minimal extra cost.

Gilts

Gilts have a shorter and less predictable estrus than sows. They also ovulate later in estrus. For gilts, inseminate the first time 12 to 24 hours after standing estrus is first detected, then again at 24 and 36 hours. A three-dose schedule is common for gilts.

The extra dose is worth the cost for gilts because they are the future of the herd. A missed estrus in a gilt delays her first farrowing by 3 weeks and adds to non-productive days.

Double Mating

Some producers use double mating, where the sow is inseminated with semen from two different boars, either in the same estrus or at different times within the estrus. This is not the same as a two-dose schedule with the same boar. Double mating with different boars can improve conception rates and litter size, but it complicates parentage records. It is most useful when you are trying to maximize conception in a valuable sow or when using semen of varying quality.

Common Mistakes That Reduce AI Success

Even experienced producers make these errors. Review your own protocol against this list.

Mistake 1: Poor Heat Detection

If you miss the first day of standing estrus, your timing will be off. If you inseminate too late, the eggs may be non-viable. If you inseminate too early, the sperm may die before ovulation. Both cost you conception.

Fix: Use a boar for heat detection. Check twice daily. Do not rely on vulva redness or restlessness alone.

Mistake 2: Rough Semen Handling

Shaking a semen bottle, dropping it, or exposing it to temperature extremes can kill sperm in minutes. The damage is invisible to the naked eye.

Fix: Treat every semen dose as if it were the only dose you have. Handle gently, store at the correct temperature, and check motility before use.

Mistake 3: Dirty Equipment

A dirty insemination catheter or a dirty vulva can introduce bacteria into the uterus. This causes endometritis, which reduces conception and can delay the next estrus.

Fix: Use a new sterile catheter for every sow. Clean the vulva before insertion. Do not reuse catheters under any circumstances.

Mistake 4: Inseminating a Sow That Is Not in Standing Estrus

If you inseminate a sow that is not in standing estrus, the cervix will not be relaxed and the catheter will not seat properly. The semen will pool in the vagina and be lost. The sow will not conceive, and you will have wasted a dose.

Fix: Confirm standing estrus with back pressure and boar exposure before you begin. If the sow does not stand, do not inseminate.

Mistake 5: Rushing the Procedure

If you insert the catheter too quickly, you can injure the cervix or miss the cervical opening. If you deposit the semen too quickly, it can reflux out. If you remove the catheter too quickly, you can pull semen back out with it.

Fix: Take your time. Insert the catheter gently. Deposit the semen over 3 to 5 minutes. Remove the catheter slowly.

Mistake 6: Ignoring the Boar

The boar is not optional. Boar exposure before and during insemination stimulates the release of oxytocin, which causes uterine contractions that help transport sperm to the oviduct. Sows inseminated without boar exposure have lower conception rates.

Fix: Always use a boar for heat detection and for stimulation during insemination. If you do not have a boar, consider using synthetic boar odor or a used boar rag, though these are less effective than a live boar.

Mistake 7: Using Poor Quality Semen

If you buy cheap semen from an unverified source, you get what you pay for. Poor motility, low sperm numbers, and contamination all reduce conception.

Fix: Buy semen from a reputable supplier with good quality control. Check motility on every dose. Keep records of semen lot numbers and conception rates by lot.

Decision Thresholds: When to Change Your Approach

Not every problem requires a major overhaul. Use these thresholds to decide when to adjust your AI program.

Conception Rate Below 80 Percent

If your farrowing rate or conception rate drops below 80 percent, investigate before making changes. Review your heat detection records. Are you detecting estrus accurately? Review your semen handling. Is the semen arriving in good condition? Review your insemination technique. Are all technicians following the same protocol?

Check one variable at a time. If you change everything at once, you will not know what fixed the problem.

Litter Size Drops by More Than One Piglet

Litter size is influenced by many factors, including genetics, nutrition, parity, and season. A drop of one piglet per litter over a few months may be normal variation. A drop of more than one piglet sustained over several months is a problem.

Review your semen supplier's fertility data. Review your sow nutrition, especially energy and amino acid intake during lactation and the wean-to-estrus interval. Review your insemination timing. Late insemination reduces litter size even when conception is successful.

Wean-to-Estrus Interval Exceeds 7 Days

The wean-to-estrus interval should average 4 to 6 days. If more than 10 percent of sows take longer than 7 days, look at lactation nutrition, sow body condition, and disease status. This is not directly an AI problem, but it affects your ability to time insemination correctly.

Seasonal Infertility

Many farms see reduced fertility in late summer and early fall, especially in hot climates. This is called seasonal infertility. Conception rates may drop by 10 to 20 percent, and litter size may decline.

If you see this pattern, adjust your expectations and your protocol. Inseminate more frequently during the summer. Provide cooling for sows and boars. Check semen handling more carefully, as heat stress affects semen quality.

Monitoring and Recordkeeping

You cannot improve what you do not measure. A simple recordkeeping system is essential for evaluating your AI program.

What to Record

For each insemination, record:

• Sow or gilt identification
• Date and time of insemination
• Parity (number of previous litters)
• Weaning date for sows
• Date of first standing estrus
• Semen lot number and boar identification
• Technician initials
• Number of doses used
• Any problems noted during insemination

What to Calculate

Calculate these numbers monthly or quarterly:

• Conception rate: Number of sows that farrow or are confirmed pregnant divided by the number inseminated, times 100.
• Farrowing rate: Number of sows that farrow divided by the number inseminated, times 100. This is lower than conception rate because of pregnancy loss.
• Litter size: Total piglets born divided by the number of sows farrowing.
• Wean-to-estrus interval: Average number of days from weaning to first standing estrus.
• Non-productive days: Days when a sow is not pregnant and not lactating.

How to Use the Numbers

Compare your numbers month to month and year to year. If conception rate drops, look at the month it dropped. Was there a heat wave? Did you change semen suppliers? Did a new technician start?

Compare technicians. If one technician has consistently lower conception rates, retrain that person. Compare boars. If one boar's semen consistently produces lower conception, talk to your supplier.

Compare parity groups. Gilts often have lower conception rates than sows. First-parity sows may have a longer wean-to-estrus interval. This is normal, but it should be tracked.

Recordkeeping Tools

A paper logbook works, but a spreadsheet is better. Many producers use a simple spreadsheet with columns for each data point. Some use commercial herd management software. The important thing is that you record the data consistently and review it regularly.

When to Call a Veterinarian or Extension Agent

Some problems are beyond what you can fix with better timing or handling. Call for professional help when you see any of these signs.

Sudden Drop in Conception

If conception rate drops suddenly by more than 15 percent over a month, do not wait. This could indicate a disease outbreak, a semen quality problem, or a systematic error in your protocol. A veterinarian can investigate and help you identify the cause.

Repeat Breeders

If more than 10 percent of sows return to estrus after breeding, or if sows return at irregular intervals, this may indicate uterine infection, hormonal problems, or poor semen quality. A veterinarian can perform ultrasound or other diagnostics.

Vaginal Discharge

If you see purulent or bloody discharge from the vulva after insemination, this indicates uterine infection. This is a serious problem that requires veterinary attention. It may be caused by poor hygiene during insemination or by a contaminated semen dose.

Abortion or Pregnancy Loss

If sows abort or resorb litters, call a veterinarian immediately. This can be caused by infectious disease, mycotoxins in feed, or other herd-level problems.

Poor Semen Quality From Your Supplier

If you consistently receive poor quality semen from a supplier, document the problem with motility checks and contact the supplier. If the problem persists, contact your extension agent for help finding an alternative supplier.

Unexplained Litter Size Decline

If litter size declines by more than one piglet per litter and you cannot explain it with timing, nutrition, or genetics, call for help. A veterinarian can check for subclinical disease, and an extension agent can help you review your nutrition program.

Setting Up an AI Program From Scratch

If you are new to artificial insemination in pigs, start with a pilot group before converting your whole herd.

Step 1: Learn the Basics

Read, attend a workshop, or work with an experienced AI technician. Do not learn on valuable sows. Practice on cull sows or on sows you would have bred naturally anyway.

Step 2: Source Semen

Find a reputable semen supplier. Ask about their quality control, their boar genetics, and their delivery schedule. Order a small quantity first and check motility on arrival.

Step 3: Prepare Your Facilities

Identify a clean, dry area for insemination. If you are inseminating in the home pen, make sure the pen is clean. If you are using a breeding area, make sure it is quiet and free of distractions.

Step 4: Train Your Team

Every person who will handle semen or perform inseminations must be trained. Do not assume that someone who has worked with cattle AI can automatically do pig AI. The anatomy and procedure are different.

Step 5: Start With Weaned Sows

Weaned sows are easier to breed than gilts. They have a more predictable estrus and a more relaxed cervix. Start your AI program with weaned sows and add gilts once you are confident in your technique.

Step 6: Keep a Boar

You need a boar for heat detection and stimulation. If you do not have a boar, your AI success will be lower. The boar does not need to be high-value genetics. He just needs to be mature, healthy, and sexually active.

Step 7: Review and Adjust

After your first month of AI, review your conception rates and litter size. Compare them to your historical natural mating results. If AI results are lower, review your protocol and make adjustments.

Economics of Artificial Insemination in Pigs

Artificial insemination is generally less expensive than natural mating when you account for the full cost of keeping a boar. A mature boar requires housing, feed, health care, and labor. He also poses a safety risk and can spread disease through the herd.

With AI, you pay per dose of semen. The cost per dose varies by genetics and supplier. Even with the cost of catheters, lubricant, and labor, AI is usually competitive with natural mating on a per-pregnancy basis.

The bigger economic benefit is genetic improvement. AI gives you access to superior genetics from proven sires. This translates to faster growth, better feed conversion, more lean meat, and more uniform pigs. These benefits accrue over multiple generations.

AI also improves biosecurity. You do not need to bring new boars onto the farm. You do not need to move sows to a boar. This reduces the risk of introducing disease.

Biosecurity Considerations

Artificial insemination can improve biosecurity, but only if you handle semen properly and keep your breeding area clean.

Semen as a Disease Vector

Semen can carry diseases, including porcine reproductive and respiratory syndrome virus, porcine circovirus type 2, and others. Buy semen only from suppliers with rigorous disease surveillance programs. Ask about their health monitoring and their testing protocols.

On-Farm Biosecurity

Clean and disinfect all insemination equipment between uses. Use single-use catheters. Do not share lubricant tubes between sows. Wash your hands or use gloves before and after each insemination.

Keep the breeding area clean and dry. Remove manure before it accumulates. Disinfect the area regularly.

Visitor and Staff Biosecurity

Anyone who handles semen or performs inseminations should follow your farm's biosecurity protocols. This includes wearing clean boots and coveralls, washing hands, and not visiting other pig farms in the previous 48 hours.

Troubleshooting AI Problems

When AI results are poor, work through this checklist in order.

Check Heat Detection

Are you detecting estrus reliably? Are you using a boar? Are you checking twice daily? Are you noting the time of first standing estrus?

Check Timing

Are you inseminating at the right time relative to standing estrus? For most sows, this is 24 hours after first standing heat, with a second dose 12 to 24 hours later.

Check Semen

Is the semen arriving in good condition? Is it stored at the right temperature? Is it within its usable life? Does it show good motility under the microscope?

Check Technique

Is the catheter seating properly? Is the semen flowing by gravity? Is the sow calm and stimulated by a boar?

Check Records

Are your records complete and accurate? Are you comparing conception rates by technician, by boar, and by parity?

Check the Herd

Are there health problems in the herd? Is there a disease outbreak? Are sows in poor body condition? Is the environment too hot or too cold?

Work through this checklist systematically. Change one thing at a time and measure the effect.

Frequently Asked Questions

How long does boar semen last after collection?

Extended boar semen maintains acceptable fertility for 3 to 5 days after collection when stored at 60 to 65 degrees Fahrenheit. Fertility declines with each day of storage. Use semen as soon as possible after receipt, and check motility before every use.

How many times should I inseminate a sow?

Most producers use two inseminations per estrus, spaced 12 to 24 hours apart. Gilts often benefit from a third insemination at 36 hours after first standing heat. Some farms use a single insemination for sows with predictable ovulation, but this requires excellent heat detection and records.

Can I use one semen dose for two sows?

No. Each semen dose is formulated for a single insemination. Splitting a dose reduces sperm numbers below the threshold needed for good conception. The cost of a second dose is far less than the cost of a missed estrus.

What temperature should boar semen be stored at?

Store extended boar semen at 60 to 65 degrees Fahrenheit. Do not refrigerate it. Do not freeze it. Do not expose it to heat or direct sunlight. Before insemination, warm the semen to 95 to 100 degrees Fahrenheit in a warm water bath for 15 to 20 minutes.

How do I know if the catheter is in the right place?

You will feel a distinct catch or lock when the catheter tip seats in the cervix. For a foam-tip catheter, the foam should compress and hold firmly. For a spiral-tip catheter, you will feel the spiral thread into the cervical folds. If the catheter does not lock, withdraw and try again.

Why did my sow not conceive after AI?

The most common causes are poor timing, poor semen quality, and poor insemination technique. Check your heat detection records. Check the semen motility. Check whether the catheter seated properly. If the problem is widespread, review your entire protocol and consider calling a veterinarian.

Can I do AI without a boar?

You can, but success rates are lower. Boar exposure stimulates uterine contractions that help transport sperm. Without a boar, you must rely on other stimulation methods, which are less effective. Most producers find that keeping a boar is worth the cost.

How soon after weaning should I check sows for heat?

Start checking sows for estrus 3 days after weaning. Most sows come into heat 4 to 6 days after weaning. Sows that take longer than 7 days may have nutrition or health problems.

What is the ideal litter size for AI?

The ideal litter size depends on your genetics, nutrition, and management. Most commercial producers aim for 12 to 14 piglets born alive per litter. AI does not directly change litter size, but using high-fertility semen from proven boars can improve litter size compared to poor natural mating.

How much does a dose of boar semen cost?

The cost varies by genetics, supplier, and semen type. Conventional semen is generally less expensive than sexed semen. Contact multiple suppliers and compare prices, but do not choose a supplier based on price alone. Semen quality and disease surveillance are more important.

Related Farming Guides

This section will be populated programmatically with links to related farming guides on swine reproduction, herd health, and breeding management. Check back soon for updated content.

Related Clinical & Scientific Guides

• Animal Welfare Audits: Building a Useful Farm Program
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• Feed Additives for Livestock: Probiotics, Enzymes, and More

References

• USDA Farm Management: https://www.farmers.gov/
• FAO Farm Management: https://www.fao.org/farmer-field-schools/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.