Are mules always infertile?
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Published in Daily Trivia
Not always -- Several female mules have produced offspring when mated to a purebred horse or ass. Since 1527 there have been more than 60 documented cases of foals born to female mules around the world. Mules and hinnies have 63 chromosomes that are a mixture of one from each parent. The different structure and number usually prevents the chromosomes from pairing up properly and creating successful embryos.
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