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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.
The average gestation period for a miniature horse is approximately 320 days, but they should be closely watched after 300 days, or sooner depending upon any physical changes you see. The normal gestation period for donkeys is 360 to 375 days (368 average.).For goats, the average is 150 days. The average gestation period for cows is 283 days. For sheep, it's 145 days.he normal gestation period for donkeys is 360 to 375 days (368 average.). For goats, the average is 150 days. The average gestation period for cows is 283 days.