Kays, John M. Formerly, Animal Industries Department, University of Connecticut, Storrs, Connecticut.
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A hybrid sired by a male ass (Equus asinus) out of a female horse (E. caballus). The opposite cross, very seldom made, produces the hinny (a hybrid between a stallion and a female ass). The mule (see illustration) and the hinny are usually sterile, but there have been a few authenticated cases of mules producing living progeny. Male mules, often called horse mules, are almost always castrated to make them more tractable as work animals. See also: Breeding (animal); Donkeys and allies; Horse production
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