Early Pregnancy Care

Once your mare is confirmed pregnant, everything changes about how you manage her. She's not just a horse anymore—she's carrying a developing foal. That foal is entirely dependent on her for nutrition, oxygen, waste removal, and protection. How well you manage the mare during pregnancy directly affects how well the foal develops, how healthy it is at birth, and how well it performs throughout its life.

Early pregnancy in horses is a critical period. The first three months of pregnancy are when the basic structure of the foal develops. If something goes wrong during this period—if the mare gets sick, if she's malnourished, if she's stressed—the foal's development can be affected. Many mare owners don't realize how important these early months are, and they don't make the adjustments they should until later in pregnancy. But damage done early is damage that can't be fixed later.

The good news is that managing a mare for early pregnancy isn't complicated or expensive. It mostly involves common sense—good nutrition, appropriate exercise, stress management, veterinary monitoring if there are concerns, and avoiding situations that could harm the developing foal. It doesn't require special facilities or exotic care. It just requires understanding what a pregnant mare needs and providing it.

Many mares have no trouble during early pregnancy and you wouldn't know they were pregnant by looking at them—their weight doesn't change much, they look normal, they move normally. Don't let that lull you into thinking you can manage them like non-pregnant horses. They're carrying a foal even if you can't see it. Management matters.

This article is going to walk you through early pregnancy care—what happens during early pregnancy, what a mare needs nutritionally and physically, what management changes you should make, what to watch for that might indicate problems, and how to set your pregnant mare up for success in carrying a healthy foal to term.

After breeding, the first thing to do is get confirmation of pregnancy. An ultrasound at ten to fourteen days after breeding can show a pregnancy, though it's not always visible before about ten days. Waiting until twelve to fourteen days gives you a clearer picture. Your vet does an ultrasound and can tell you if there's an embryo, whether it's in the right location, and whether it looks healthy. That confirmation is important—you know you're dealing with a pregnant mare and can plan accordingly.

During early pregnancy—the first three months—the foal is developing its basic structure. The embryo starts as a tiny spot on the ultrasound and gradually develops into a recognizable horse shape. By three months, the foal has most of its major organs and systems formed, though they're not yet functional. The mare's job during this period is to provide stable nutrition and protect that developing foal.

This is when pregnancy loss is most likely to happen. Many mares lose pregnancies in the first three months, and it's often not obvious. A mare might lose a pregnancy and cycle back into heat, and nobody might notice if she's not being monitored closely. Pregnancy loss can happen for various reasons—hormonal imbalances, infection, chromosomal abnormalities, accident or trauma, nutritional deficiency, or just bad luck. Some losses are unavoidable, but providing optimal management reduces the risk.

As pregnancy progresses through the first three months, the mare might show few obvious signs. Some mares develop a shiny coat and look obviously better. Some gain weight noticeably. Some show behavioral changes—becoming calmer or more irritable depending on individual temperament. Some show no obvious signs at all. Don't be fooled by a mare looking normal. She's still pregnant and still needs care adjustments.

Nutrition is the cornerstone of early pregnancy care. A pregnant mare needs quality forage and appropriate nutrition. Many mares can meet their nutritional needs on good-quality hay alone during early pregnancy, assuming they're in reasonable body condition to start with. If the mare is thin or the hay isn't high-quality, she needs supplemental grain or other feed to meet her energy needs. She also needs adequate protein and minerals, particularly calcium, phosphorus, copper, and zinc, which are essential for foal development.

Vitamins matter too. A deficiency in vitamin A, vitamin E, or selenium during pregnancy can cause birth defects or problems. Most good-quality hay provides adequate vitamin A, but as hay ages, vitamin A content degrades. Vitamin E and selenium are often deficient in many regions' forage. Many breeders add a ration balancer or prenatal vitamin to ensure adequate micronutrients.

Water is crucial. A pregnant mare should have constant access to clean, fresh water. She's drinking for two—for her own body and for the developing foal. Some mares drink less in winter if water freezes, which is why providing warm water or ice-free water in winter is important.

Exercise should continue during early pregnancy, but it should be appropriate. Light to moderate exercise is actually beneficial for a pregnant mare—it maintains her fitness, helps her cardiovascular system, and is good for mental health. What you want to avoid is strenuous exercise, hard training, or situations where the mare might fall or get injured. A mare that's pregnant can do light trail rides, light work, light turnout. She shouldn't be doing heavy training, jumping, competitive events, or anything stressful.

Management during early pregnancy should minimize stress. Stress is bad for pregnant mares. Stress hormones can affect pregnancy continuation and foal development. Keep the mare in a calm, stable environment. Avoid moving her if possible, avoid introducing her to new horses if possible, avoid situations that upset her. If changes are necessary, make them gradually so the mare has time to adjust.

Housing should be safe and comfortable. The mare should have shelter from weather extremes, good footing, access to water and hay, and safe fencing. She should be protected from bullying by other horses. If she's on pasture, make sure there's nothing she could catch her legs on or injury herself with. If she's stalled, ensure the stall is large enough for her to move and lie down comfortably.

One tricky aspect of early pregnancy is that it can be hard to confirm the pregnancy is still viable. Ultrasounds at checkpoints—maybe at thirty days, then at sixty days—can confirm the pregnancy is progressing normally. Some mares don't show obvious signs, and some mares that look obviously pregnant still lose the foal without obvious signs. Regular ultrasounds give you peace of mind that the pregnancy is developing normally.

Managing a pregnant mare during early pregnancy is mostly about consistency and thoughtful decision-making. Feed her consistently—the same feed at the same times every day. Mares like routine and it helps their digestive system. Any diet changes should be gradual, introducing new feed over several days rather than suddenly switching.

Monitor her body condition. She shouldn't be overweight or underweight. An ideal pregnant mare is in moderate body condition—not fat, but not thin. Poor body condition can affect pregnancy continuation and foal quality. Good body condition supports both the pregnancy and the mare's ability to handle carrying a foal.

Provide consistent, appropriate exercise. If the mare was being ridden before pregnancy, light riding can continue. If she was turned out on pasture, she can continue pasture turnout. What matters is consistency. A mare that was stalled and had no exercise shouldn't suddenly be heavily exercised. A mare that was trained shouldn't suddenly stop all exercise. Keep things consistent and appropriate.

Monitor for signs of problems. A mare shouldn't be colic-prone during pregnancy, but colics do happen. Watch for any signs of abdominal pain, depression, or appetite changes. Watch for any vaginal discharge—clear or mucousy discharge is normal, but purulent or bloody discharge might indicate a problem. Watch for fever or signs of infection. If something seems wrong, call your vet.

Limit exposure to illness. A pregnant mare's immune system is somewhat suppressed during pregnancy. She's more vulnerable to infection. Don't expose her to sick horses if possible. Keep her separated from any horses showing signs of illness. Make sure her vaccines are current—it's usually recommended to vaccinate for tetanus and rhinopneumonitis during early pregnancy to transfer antibodies to the foal, though this should be discussed with your vet for your specific situation.

Avoid medications unless necessary. Some medications are teratogenic—they can damage the developing foal. Your vet can advise about what's safe during pregnancy, but in general, avoid treating anything that isn't a true health problem. Prevention through good management is far better than treatment.

Manage parasites carefully. A pregnant mare should be dewormed before breeding if possible, and during pregnancy only with vet guidance using drugs that are safe for pregnancy. Internal parasites can affect foal development, but some dewormers can be hard on a pregnant mare. Your vet can advise about what's appropriate.

Limit access to plants or feeds that could be harmful. Some plants are toxic to horses generally. Some herbs might cause problems in pregnancy. Stick with safe, known feeds and forage. Avoid moldy hay or grain, which can contain toxins that might affect pregnancy. Be conservative with anything you're uncertain about.

Avoid excessive heat or stress. Early pregnancy can be a tricky time, and unnecessary stress can trigger pregnancy loss. Avoid situations that are upsetting—hauling, loud noises, scary events, social conflict. Keep the mare in a calm, stable environment where she feels safe.

Make sure her feet are cared for. Hoof maintenance should continue during pregnancy. The mare's weight distribution changes slightly as she carries a foal, so her feet might need adjustments. Work with a good farrier who understands pregnant mares and can trim appropriately.

One common complication is a mare losing her pregnancy without obvious signs. Many early pregnancies are lost silently—the mare reabsorbs the foal and cycles back into heat. If nobody's monitoring closely, you might not realize the pregnancy was lost until weeks or months have passed. This is why ultrasounds during early pregnancy are valuable—they confirm the pregnancy is still developing.

Another complication is a mare showing pregnancy complications that weren't apparent initially. Maybe she has a chronic illness that gets worse during pregnancy. Maybe she has reproductive tract issues that prevent proper implantation or placental development. Maybe her body chemistry is off in ways that affect pregnancy continuation. These things sometimes only become apparent when you're pregnant and the body's under the stress of supporting a foal.

There's also the complication of not recognizing that a mare is having problems. A mare might develop a low-grade infection that's affecting the pregnancy but isn't obvious without veterinary examination. She might have hormonal imbalances that aren't visible. She might be in pain from a condition you're not aware of. Regular veterinary checks help catch these problems early.

Another issue is the mare losing the foal due to an accident. She slips on ice, falls in a ditch, gets kicked by another horse, has a collision with a fence or gate. Early pregnancy is vulnerable and trauma can cause pregnancy loss. Protecting the mare from injury is important.

There's also the complication of nutritional deficiency during early pregnancy. If the mare isn't getting adequate nutrition, the foal's development can suffer. The mare might not show obvious signs of being underfed, but the foal is being undernourished. This can result in a foal that's smaller at birth, weaker, or more prone to developmental problems.

Another issue is stress during early pregnancy. A mare that's moved to a new location, introduced to new horses, or exposed to a stressful situation during early pregnancy is at higher risk of losing the pregnancy. Even stress that seems minor can be significant to a pregnant mare.

There's also the complication of the mare getting sick during early pregnancy. A mare with fever, infection, or systemic illness is at risk of pregnancy loss. The infection or illness affects the foal or the placenta, and pregnancy is lost. Protecting the mare from illness is important.

Another potential issue is medication given during early pregnancy without realizing the mare was pregnant. Some medications are teratogenic or harmful to developing foals. If you treat a health problem without knowing pregnancy is present, you might inadvertently harm the foal.

Lastly, there's the complication of over-managing a pregnant mare to the point of anxiety. Some people are so worried about losing the pregnancy that they stress the mare constantly with checking, worrying, being anxious. That stress can actually contribute to pregnancy loss. Finding a balance between appropriate management and not obsessing is important.

A veterinarian should be involved in early pregnancy care, at least for ultrasound confirmation and probably for a check during early pregnancy. Your vet can confirm pregnancy is progressing, can identify any apparent problems, and can advise on management specific to your mare's situation. If you don't have a regular vet relationship, establishing one before breeding is ideal.

Your vet can also advise about nutrition during pregnancy. If you're uncertain whether your mare's getting adequate nutrition, your vet can assess and recommend appropriate supplementation. This is especially valuable if your mare has special nutritional needs.

If the mare has a health condition, your vet can advise about managing that condition during pregnancy. They can tell you which medications are safe, which adjustments to management might help, and whether the condition poses any risk to the pregnancy.

You might also work with a equine nutritionist if your mare has specific nutritional needs or if you're wanting to optimize her nutrition during pregnancy. A nutritionist can design a feeding program that ensures adequate energy, protein, vitamins, and minerals.

If the mare shows any signs of problems, veterinary help should be sought promptly. Pregnancy loss might be preventable if caught early. Problems that seem minor might become serious if not addressed. Getting professional input helps you make good management decisions.

Once your mare is confirmed pregnant, start thinking of her as a pregnant mare first and a horse second. Her job is to carry that foal successfully. Everything you do should support that goal. Nutrition, exercise, stress management, health care—all of it should be oriented toward supporting the pregnancy.

Understand that early pregnancy is important and vulnerable. Many mare owners assume early pregnancy is easy and that problems only happen later. Actually, early pregnancy is when miscarriage is most likely and when foal development is most critical. Invest in early pregnancy management and monitoring.

Also understand that you don't need to keep your mare in a bubble. She doesn't need complete stall rest. She doesn't need exotic care. She just needs good-quality forage and appropriate management—the basics done well. Light exercise, good nutrition, a calm environment, and stress reduction are what matter.

Don't obsess to the point of causing stress. A pregnant mare senses anxiety and that can affect pregnancy. Manage sensibly and appropriately, then relax and trust that you're doing the right things.

Also recognize that you can do everything right and still lose a pregnancy. Some losses are just bad luck—chromosomal abnormalities, random accidents, things you can't control. You can't prevent every loss. What you can do is manage thoughtfully to reduce risk. That's enough.