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Occaisonally a mare will give birth at a shorter period than 11 months long, which can be at 10.5 months. Anytime before that foals that are born are deemed premature. On average, 340 days but a healthy gestation can be as few as 315 days and as much as 370. The gestational period of a horse is 11 months. 11 to 12 months all deppeand on the mare I had a mare go to 13 month before dropping. + 5 others found this useful.
If you have a breeding mare or your mare has come into contact with a stallion during her heat cycle, you may want to determine if she is pregnant. The gestation period, or time a horse carries a foal, is 11 months, and mares do not begin to look round in the stomach until the last 3 months of pregnancy.. Have a veterinarian use ultrasound to determine whether the mare is pregnant. An ultrasound requires the vet to insert a probe into the mare's rectum to take pictures that can confirm pregnancy. From 16 days, the pregnancy can be detected, and at 55 to 70 days they might be able to determine the sex.