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All things being equal...good nutrition, and a pristine uterus in a mature, young mare lends itself to earlier foaling. Older virgin mares can be more problematic. A bred immature mare/filly can go longer.

Generally a minimum of 310 days will result in a viable foal, if the pregnancy is normal (no infection, body pregnancy etc.) Nominal is 335-345 days...

Mares can go a full year in foal under certain circumstances and produce a healthy foal.

Plan for an early foal...first foal mares can foal without developing an udder...hope for around 335-345 days.

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13y ago

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