stallion

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stal‧lion/ˈstæljən/ noun [COUNTABLE]
[date : 1300-1400; Language : Old French; Origin : estalon]
a male horse that is fully grown, especially one that is used for breeding ⇨ mare

noun
EXAMPLES FROM CORPUS
▪ Aged horses, especially stallions, are more like old people, and are more stressed by change than younger horses.
▪ And to the van of them, high upon a pure-bred white Arab stallion, the Wolf of Kabul.
▪ He stood for a few moments thinking, and looking apprehensively from one stallion to the other.
▪ Isolating stallions from other horses obviously plays a large part in the aggression and even viciousness some stallions display towards mares.
▪ Jester was an appaloosa stallion who had a very close relationship with his owner.
▪ Rufus was a bit of a centaur himself, a big roan stallion, and she was a little cat-eyed - waif.