Is Your Broodmare a Candidate for a Foal-Heat Pregnancy? – The Horse
ADVERTISEMENT Because mares have such long pregnancies, often lasting more than 11 months, they give birth later each calendar year if they’re rebred a month or more after foaling. Eventually they’ll have to stay empty a season to catch up. But breeding on the foal heat—estrus occurring within 20 days after foaling—can keep mares on a regular annual foaling cycle, said Patrick McCue, DVM, PhD, Dipl. ACT, professor and equine reproduction specialist at Colorado State University. However, mares are less likely to conceive on foal heat than subsequent heats, and they’re more likely to ...
Source: thehorse.com