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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.
Gestation is the term used to describe the time from ovulation to birth. It is important for breeders and dog owners interested in having puppies to note that ovulation period may not be the same as the breeding period. For a normal dog, the period of gestation is between 56 to 66 days with the average falling at 63 days. The veterinarian can confirm pregnancy by ultrasound as early as the 18th day after ovulation. The initial stages of dog pregnancy are marked by few changes.