Pregnant Mare Care

Caring for a pregnant mare is different at each stage of pregnancy. A mare at month two of pregnancy needs different management than one at month nine. Understanding how pregnancy progresses and how the mare's needs change helps you adjust management appropriately throughout those eleven months. Most problems with pregnant mares stem from inappropriate management - overworking them when they're heavy, undermining them when they're early in pregnancy, or not providing adequate nutrition when they need it most.

The general principle of managing a pregnant mare is support without interference. You're not trying to change the mare or force her into a mold. You're supporting her pregnancy, keeping her comfortable, and providing what she needs to grow a healthy foal. A mare that's well-supported will usually do what she needs to do naturally. One that's stressed or poorly managed will struggle, and the pregnancy or the mare might suffer.

Different breeders have different philosophies about how active to keep pregnant mares. Some ride them regularly throughout pregnancy. Others hand-walk them. Some turn them out on pasture and let them move as they want. All of these approaches can work if they're done thoughtfully. The key is understanding where your mare is in pregnancy and adjusting activity accordingly.

Nutrition for a pregnant mare changes significantly over the course of pregnancy. Early pregnancy demands are modest. Late pregnancy demands are enormous. Getting nutrition right - not just calories but the right kinds of nutrition - affects whether the foal develops properly and whether the mare has adequate resources to produce milk after foaling.

Understanding individual mare variation is important. Mares are different. One might carry her pregnancy obviously from month four on. Another might not look obviously pregnant until month eight. One might be emotionally ready to quit work early in pregnancy. Another might want to keep moving. Learning your individual mare and respecting what she tells you through her behavior and physical changes is more valuable than following a strict protocol based on month of pregnancy.

Early pregnancy - months one through three - is when most mares seem essentially normal. The foal is tiny, growing but not yet demanding massive resources from the mare. The mare might not look particularly pregnant. Many people ride pregnant mares normally during this stage. The mare can work, can be active, and life proceeds mostly as usual. The main thing is to avoid stress and trauma. A hard fall or severe trauma can cause early pregnancy loss, so caution with dangerous activities makes sense.

What changes in early pregnancy is that the mare's cycle stops. She doesn't come back into heat. If a breeder is paying attention to the mare's heat cycles, the absence of heat suggests pregnancy even before confirmation. Hormonally, the mare's body is shifting into pregnancy mode, even though it might not be obvious physically.

Mid pregnancy - months four through six - is when the foal starts growing noticeably and the mare often starts looking more pregnant. The foal is becoming increasingly real - it's growing body parts, its organs are developing, and it's consuming more resources from the mare each day. Some mares' temperaments change during mid pregnancy - they become calmer or more cautious. Others stay essentially unchanged. The mare's exercise capacity might decrease slightly as her center of gravity shifts, but she's still capable of moderate work.

Nutrition becomes more important during mid pregnancy, though the demands aren't yet at their peak. The mare might start getting supplemental grain if she wasn't before, or the amount might increase. Providing good quality forage - hay or pasture - becomes increasingly important. Some mares start showing obvious behavioral changes - moving more carefully, being less willing to jump or do strenuous work. Respecting these changes is part of managing mid pregnancy well.

Late pregnancy - months seven through eleven - is when everything shifts dramatically. The foal becomes enormous. The mare's abdomen gets huge. Her center of gravity is completely off. Some mares become very uncomfortable - they might be reluctant to move much, they might be easily fatigued, they might shift their weight constantly looking for a comfortable position. This is when the foal's growth is most explosive - in the final weeks, the foal is growing exponentially and demanding massive nutrition from the mare.

During late pregnancy, the mare's behavior changes noticeably in many cases. She might become more cautious, less willing to work, more focused on eating and resting. Some mares retain their willingness to move and work even when heavily pregnant. Others clearly want to slow down. Listening to what the mare is telling you through her behavior is important during this stage. If she's clearly uncomfortable or reluctant to work, forcing her isn't appropriate or safe.

The final weeks of pregnancy - weeks before foaling - bring additional changes. The mare's nipples relax and start to fill. Her vulva becomes more relaxed. She might develop milk or colostrum a few days before foaling. These are signs that foaling is approaching. The mare might become restless or unpredictable in temperament as foaling gets close. Some mares become very calm right before foaling. Others become anxious. Individual variation is normal.

Physical appearance changes through pregnancy. Early on, you might only know the mare is pregnant because she's not cycling. By month six, most mares look obviously pregnant to anyone paying attention. By month nine, it's unmistakable. The mare's body is dedicated to carrying the foal - her energy, her resources, all of it is focused there.

Exercise management for a pregnant mare changes over the course of pregnancy. Early pregnancy can usually handle normal work. As pregnancy advances, intensity should decrease. By late pregnancy, work should be minimal. Hand-walking is appropriate for a mare in late pregnancy. Light riding or groundwork might be okay in mid-pregnancy. The key is avoiding anything that stresses the mare or puts her at risk of falling or trauma.

Nutrition management is the most important thing you can control for a pregnant mare. Early pregnancy doesn't require huge nutritional changes. Good quality forage - whether pasture or hay - is fine. If the mare is working hard, some grain might be appropriate. As pregnancy advances, nutrition becomes more critical. In the final trimester especially, the foal's growth is explosive and the mare needs adequate calories plus the right minerals and vitamins.

A pregnant mare eating only hay or pasture might not get adequate mineral content, especially in the final months. Supplemental grain formulated for pregnant mares provides the minerals and vitamins that foal development requires. Copper, zinc, calcium, and phosphorus are particularly important, and the ratio between calcium and phosphorus matters. Grain formulated specifically for pregnant mares has these mineral ratios balanced appropriately.

Water intake is sometimes overlooked but it's crucial. A pregnant mare needs water constantly. In winter, water needs to be unfrozen and warm enough that the mare is willing to drink. In summer, constant access to clean water is essential. A mare that's not drinking adequately is at risk for colic, which is serious in pregnancy.

Housing for a pregnant mare should be safe. She needs shelter from harsh weather. In late pregnancy, she might be uncoordinated and clumsy as she moves around - she needs a safe environment where she's not going to injure herself falling or getting caught on something. A run-in shed is minimal. A stall is appropriate. Access to pasture is good if the pasture is safe and the mare has shelter available.

Farrier work needs to happen regularly. Pregnant mares especially need good foot care. As they get heavier, their feet carry increasing weight. Regular trims help prevent problems. Some farriers are hesitant to work on pregnant mares, but most can work on them if handled carefully. A pregnant mare in late pregnancy might be uncomfortable standing for extended periods, so working quickly and efficiently helps. Some breeders have their mares trimmed more frequently during pregnancy to minimize the work needed at each trim.

Vaccination and deworming should be planned around pregnancy. Most routine vaccines are given before pregnancy to avoid any issues. Deworming during pregnancy is generally fine - many dewormers are safe for pregnant mares. Working with a veterinarian on the appropriate protocol for your mare is best.

Handling of a pregnant mare should become increasingly careful as pregnancy advances. Catching her for routine care is fine. Restraining her forcefully or doing invasive procedures when not necessary isn't appropriate. The mare's comfort and the pregnancy's safety should be priorities. Most pregnant mares are cooperative if they're asked to do things gently.

Attention to signs of problems is important throughout pregnancy. Any colic, discharge, behavioral changes, or signs of illness warrant veterinary attention. A pregnant mare that's colicky is an emergency - colic in pregnancy can lead to foal loss or mare death. Any mare showing signs of distress needs prompt veterinary evaluation.

Early pregnancy loss, while less common than many people think, does happen. A mare can be confirmed pregnant and then lose the pregnancy. This might not be the breeder's fault - chromosomal abnormalities in the embryo, infections, or nutritional issues can cause loss. But some management factors - severe stress, trauma, inadequate nutrition - increase risk. Managing to minimize these risk factors helps protect early pregnancies.

Twin pregnancy is a serious complication. If a mare carries twins, the pregnancy is usually complicated and foal loss often results. Some breeders intervene to reduce twins to a single foal early in pregnancy. If twins make it to term, foaling is usually difficult and both foals or the mare might not survive. Early ultrasound to detect twins and manage accordingly is important.

Colic in a pregnant mare is an emergency. A mare that's heavily pregnant and colicky can't be managed the same way as a non-pregnant horse. Surgery might be necessary and the mare's pregnancy complicates anesthesia and recovery. Some cases of colic during pregnancy result in foal loss or mare death. Prompt veterinary attention to any colic in a pregnant mare is essential.

Infection in the uterus - placentitis - can lead to foal loss or weak foals at birth. Infected placentas don't provide adequate nutrition to the foal. If this is suspected, veterinary intervention is important. Some cases can be managed with antibiotics and supportive care.

Metabolic problems in late pregnancy can be serious. A mare that's severely overweight going into late pregnancy is at risk for conditions like equine metabolic syndrome or gestational diabetes. These can cause foaling complications or weak foals. Maintaining the mare in good body condition throughout pregnancy is preventive.

Toxemia - a buildup of toxic substances in the mare's bloodstream - can occur in late pregnancy, especially in mares that are overweight or undernourished. This is serious and can be life-threatening to both mare and foal. A mare showing signs of toxemia - depression, loss of appetite, possible neurological signs - needs emergency veterinary attention.

Premature foaling - the mare foaling before the foal is developmentally ready - results in weak, vulnerable foals that often struggle to survive. Some foals born prematurely lack the neurological maturity to nurse. Recognizing signs of impending foaling and getting veterinary help if foaling seems premature is important.

Foaling complications are more likely in mares that had difficult pregnancies or in those with certain complications. A mare that had a difficult pregnancy might have a difficult foaling. Preparing for potential complications and having veterinary support available helps manage foaling problems if they occur.

Abnormal foal positioning can develop late in pregnancy. Some foals aren't positioned correctly for birth. If this is detected through ultrasound, veterinary intervention might help. If the foal is malpositioned at foaling, dystocia results and emergency help is needed.

Placental problems can lead to weak foals. Insufficient placental attachment, placentitis, or other placental issues result in foals that don't get adequate nutrition during the final weeks of pregnancy. These foals are often weak, undersized, or immunocompromised at birth.

A veterinarian can monitor a mare's pregnancy and assess whether everything is progressing normally. Many breeders have a vet check their mares during pregnancy - sometimes at one or more specific points, sometimes monthly in late pregnancy. The vet can detect complications that might not be obvious to the owner.

Ultrasound monitoring throughout pregnancy allows vets to assess foal development and detect problems. Early ultrasound confirms pregnancy and foal viability. Mid-pregnancy ultrasound assesses the foal's size relative to mare and pregnancy stage. Late pregnancy ultrasound can assess positioning and detect abnormalities.

Veterinarians can advise on nutrition for a pregnant mare, potentially recommending specific supplements or feed if they think it's needed. They can assess body condition and recommend adjustments if the mare is getting too fat or too thin.

If complications arise during pregnancy, veterinary intervention might be needed. A mare with infection in the uterus might need antibiotics. One with nutritional deficiency might need supplementation. One showing signs of toxemia needs emergency treatment. Having a veterinarian involved means these problems can be identified and managed.

Veterinarians familiar with breeding should be involved in the final weeks before foaling. They can assess the mare's readiness to foal and ensure preparations are being made appropriately. They can be on call for foaling questions or problems.

The costs of veterinary care for a pregnant mare vary depending on what's involved. Basic monitoring - one or two vet checks during pregnancy - might be modest. Intensive monitoring with multiple ultrasounds or emergency interventions is more expensive. The value depends on how important the mare is and how much certainty the breeder wants about the pregnancy's progress.

The biggest consideration is that managing a pregnant mare well requires understanding how the pregnancy changes over time and adjusting accordingly. What's appropriate management at month two isn't appropriate at month nine. Dynamically adjusting based on the mare's stage of pregnancy, her physical appearance and behavior, and her apparent comfort level is part of being a thoughtful breeder.

Understand that the mare is an individual and will express her pregnancy in her own way. Some mares are obviously pregnant early on. Others hide their pregnancy until late. Some become calm. Others become anxious. Respecting individual variation and managing based on what your specific mare is telling you is more effective than following a rigid protocol.

Recognize that nutrition in late pregnancy is particularly important and often neglected. Many breeders don't realize how much the foal is growing in the final weeks or how much nutrition is being demanded. Providing adequate and appropriate nutrition in late pregnancy is crucial for foal development and mare recovery post-foaling.

Understand that early pregnancy is actually more fragile than many people realize. While mares can usually handle normal work in early pregnancy, unnecessary stress or trauma increases risk of loss. Being thoughtful about activity level early in pregnancy, even though it might not seem necessary, is part of protecting the pregnancy.

Finally, remember that investment in managing a pregnant mare well pays off. A mare that's well-managed through pregnancy is going to foal more successfully, recover better, and produce a healthier foal. The eleven months of pregnancy are foundational for the foal's entire life, and the mare's recovery and future fertility. Getting this period right matters enormously.