Impending Arrival

by: Heather Smith Thomas
Determining when a mare will foal is art and science, but there are tests to help you pinpoint the due date. Gestation in mares is estimated to last about 340 days, but this is just an average, since mares often foal as much as three weeks earlier or later than this standard time. Mares are notoriously unpredictable, and this is why horse breeders often try to figure ...