An intact male ass (donkey or burro) is called a jack or jackass.
Any neutered male equine (horse, mule, donkey) is called a 'gelding'.
According to ruralheritage.com some people also refer to a neutered male as a 'John' and:
'... (In England the Donkey Breed Society has decreed that male donkeys will be called stallions. Although this terminology is not used in the USA, Australia, or Canada, you may run across it in British books about donkeys.)'
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There is no such thing as a "neutered cow." You can get a neutered bull, which is called a steer, or a spayed heifer, but never a "neutered cow."
A male donkey is called a jackass.
a jack or jackass
Jackass = Esel
They are currently filming for Jackass 3