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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.
Mares have an average gestation time of 340 days or approximately 11 months, though some people have reported that when a mare is carrying a mule foal she may go a week or two longer.Here is a handy charge for calculating when your mare should be due:Donkey jennets have an average gestation of 365 days or 12 months, though there have been occasional cases of a donkey giving birth to a healthy foal as early as 10 1/2 months or as late as 14 1/2 months from her last breeding date.ares have an average gestation time of 340 days or approximately 11 months, though some people have reported that when a mare is carrying a mule foal she may go a week or two longer. Here is a handy charge for calculating when your mare should be due: