A female donkey can carry her foal for over 13 months
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In donkeys, pregnancy lasts about 371 days on average, compared with roughly 342 days in mares. The gap is not a strict rule, though: duration varies widely from one jenny to another, yet stays fairly consistent for the same jenny from one pregnancy to the next.
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Veterinary references report that a donkey's gestation can range from 11 to 14.5 months, and that a pregnancy longer than 400 days is not unusual. In mares, the range is narrower, around 11 to 12 months.
Another recent study suggests that a male foal may lengthen gestation by about five days, but this finding is debated. The biological reasons behind this longer pregnancy have not been established.
