09-01-2009, 09:44 AM
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With a mare who has foaled previously IMO there is really no cutoff- it totally depends on the mare, the owner, and the vet. It might be somewhat more of a challenge to get *some* older mares in foal if left open for several years, but diligent management/veterinary assistance can often solve that. Of course the random mare might become unbreedable with age, and the risks for problems with the mare and/or foal do gradually increase with older mares, but all of that considered, if she is currently reproductively healthy and cycling and kept in good condition with proper nutrition/maintenance care, she is likely to produce for you well into the future.