The gestation length of mares is typically accepted as 335 to 342 days, but may range from 300 to 400 days. Most studies examining factors that may affect gestation length have been conducted in the Northern Hemisphere where foaling management may be markedly different from routine management in Australasia, where foaling takes place outdoors at pasture, and mares are kept at pasture year-round.

van JD, Rijssen, EK Gee, CW Rogers, and JR O'Brien

Proceedings of the New Zealand Society of Animal Production, Volume 70, Palmerston North, 146-148, 2010
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