Horse Mating Donkey _verified_
A: Almost never. Male mules are always sterile. They are castrated to make them safe to work with.
The logic behind the cross is simple: . Mules possess "hybrid vigor," meaning they are physically harder, more resilient, and less prone to disease than either of their parents. Horse Mating Donkey
The result of a horse and donkey mating depends entirely on which species is the mother and which is the father. A: Almost never