In general, you should treat your pregnant mare no different than normal during the first seven months of pregnancy. While your mare is pregnant:

• Provide a nutritionally balanced diet of high-quality forage and a ration balancer; mineral imbalances, such as copper and zinc, need to be avoided in the pregnant mare
• Provide plenty of fresh, clean water
• Do not overfeed
• Avoid exposing your mare to other horses (especially young horses or those that travel), which could risk injury or disease
• Avoid transporting your mare, if possible
• Consult with your veterinarian to keep your mare current on vaccines and deworming
• Provide routine dental and hoof care
• Only use medications or other supplements if your veterinarian prescribes them

Your mare will need more energy as the foal grows rapidly during the last four months of pregnancy. This can be provided with quality hay and forage, though grains and other concentrated feeds may be needed. Your mare should have light to moderate exercise during this time. Avoid strenuous activity or heavy exercise. The mare’s body condition should be your main source of judging any nutritional adjustments. Your veterinarian can provide a proper nutritional and exercise program that will not cause the mare to become obese or underweight.

Contact your veterinarian if you notice any vaginal discharge or dripping milk. This could be a sign of abortion or placental problems. If you find the placenta or fetus, place in a clean bag in a cool area for your veterinarian to evaluate. This is important to discover why the mare aborted, and to determine if treating the mare is necessary. Also, remove your mare from the other pregnant mares, as she may be a source of infection for the others.  If your horse does abort, your veterinarian will need to examine the mare to be sure she is healthy.