Properly supporting a pregnant mare is essential for the health of both mother and foal. From the earliest weeks of gestation through to foaling, mares have unique nutritional and health needs that differ from those of non-pregnant horses. Understanding these requirements helps ensure a safe pregnancy, a healthy birth, and a strong start for the newborn foal.
Whether you’re an experienced breeder or preparing for your first foal, this guide covers the fundamentals of mare care during pregnancy, including feeding strategies, health monitoring, and best practices for daily management. For those interested in learning more about horse breeds and their unique needs, the complete guide to Friesian horses offers additional insights into breed-specific care.
Understanding the Stages of Equine Pregnancy
Equine gestation typically lasts about 340 days, or roughly 11 months. The pregnancy can be divided into three trimesters, each with its own set of care considerations:
- First Trimester (Conception to 110 days): Early pregnancy is a delicate time. Embryonic loss is most likely during this period, so minimizing stress and ensuring a stable environment are critical.
- Second Trimester (110 to 220 days): The fetus develops rapidly. Nutritional needs begin to change, but dramatic increases in feed are not yet necessary.
- Third Trimester (220 days to foaling): The majority of fetal growth occurs now. The mare’s energy, protein, vitamin, and mineral requirements increase significantly.
Key Nutritional Needs for Pregnant Mares
Nutrition is the cornerstone of mare care during pregnancy. A balanced diet supports fetal development, maintains the mare’s health, and prepares her for lactation.
Forage as the Foundation
High-quality forage, such as grass or legume hay, should make up the bulk of the mare’s diet. Forage provides essential fiber and nutrients, supporting digestive health and preventing colic. During early pregnancy, most mares can maintain their condition on good pasture or hay alone.
Concentrates and Supplements
As the pregnancy progresses, especially in the last trimester, forage alone may not meet all nutritional demands. Adding a balanced concentrate or grain mix can help provide extra calories and nutrients. Look for feeds formulated for broodmares, as these contain the right blend of protein, vitamins, and minerals.
- Protein: Requirements increase in late gestation. Alfalfa hay or a mare-specific concentrate can help meet this need.
- Calcium and Phosphorus: Essential for fetal bone development. Maintain a proper ratio (about 2:1 calcium to phosphorus).
- Trace Minerals: Copper, zinc, and selenium are vital for fetal growth and immune function. Consult your veterinarian about supplementation if your region’s soil is deficient.
- Salt: Provide free-choice salt blocks to ensure electrolyte balance.
Always introduce dietary changes gradually to avoid digestive upset.
Maintaining Health and Monitoring the Pregnant Mare
Beyond nutrition, regular health checks and preventive care are crucial for a successful pregnancy. Monitoring body condition, providing appropriate exercise, and keeping up with veterinary care all play a role in optimal mare care during pregnancy.
Body Condition Scoring
Keep the mare in moderate body condition—neither too thin nor overweight. A body condition score (BCS) of 5–6 on the Henneke scale is ideal. Overweight mares are at higher risk for complications, while underweight mares may not have enough reserves for lactation.
Veterinary Care and Vaccinations
Schedule regular veterinary checkups throughout gestation. Important aspects include:
- Deworming: Follow a veterinarian-recommended deworming schedule. Avoid certain medications in early pregnancy.
- Vaccinations: Keep up to date on core vaccines. In the final months, vaccinate for diseases like equine herpesvirus (EHV-1) to protect the unborn foal.
- Ultrasound and Palpation: These tools help monitor fetal development and detect any issues early.
Consult your vet about specific vaccination and deworming protocols for your region and herd.
Exercise and Turnout
Regular, moderate exercise is beneficial for pregnant mares. Daily turnout in a safe pasture encourages movement, supports circulation, and helps maintain muscle tone. Avoid strenuous work, especially in late gestation, and always monitor for signs of discomfort or fatigue.
Preparing for Foaling and Postpartum Care
As the due date approaches, preparation becomes even more important. Set up a clean, safe foaling area, and gather supplies in advance. Monitor the mare for signs of impending labor, such as udder development, waxing of the teats, and relaxation of the pelvic ligaments.
After foaling, continue to provide high-quality nutrition and monitor both mare and foal closely. The mare’s energy needs remain high during lactation. Prompt veterinary checks help ensure a healthy start for the newborn.
Common Challenges and How to Address Them
Even with the best care, issues can arise during pregnancy. Being aware of potential problems helps you act quickly:
- Colic: Pregnant mares are at risk, especially in late gestation. Provide consistent feeding schedules and plenty of fresh water.
- Fescue Toxicity: Avoid feeding tall fescue grass infected with endophyte fungus, as it can cause prolonged gestation and foaling difficulties.
- Placental Problems: Watch for abnormal vaginal discharge or signs of discomfort and consult your vet immediately if you notice anything unusual.
For more on equine communication and recognizing subtle signs of distress, see our article on equine behavior and communication.
Additional Resources and Breed Considerations
Some breeds may have specific needs or tendencies during pregnancy. For example, Friesians are known for their gentle temperament but may require extra attention to nutrition and hoof care. To learn more about their unique qualities, visit the Friesian sport horse profile for insights on their care and potential in competition.
Staying informed and working closely with your veterinarian is the best way to support your mare through every stage of gestation and foaling.
Frequently Asked Questions
How much should I feed my pregnant mare?
During the first two trimesters, most mares maintain their condition on high-quality forage and a vitamin-mineral supplement. In the last trimester, increase feed gradually, focusing on energy, protein, and minerals. Avoid overfeeding to prevent obesity-related complications.
What vaccinations are necessary during pregnancy?
Core vaccines (such as tetanus, influenza, and West Nile virus) should be kept up to date. In the final months, vaccinate for equine herpesvirus (EHV-1) and other region-specific diseases as recommended by your veterinarian.
Can my pregnant mare continue light work?
Yes, most mares benefit from regular, moderate exercise throughout pregnancy. Light riding or turnout helps maintain muscle tone and circulation. Always monitor for signs of fatigue or discomfort and reduce activity as needed in late gestation.