What is an uncastrated male horse called?

An uncastrated male horse is called a stallion or, when used for breeding, a stud.

Detailed explanation

An equine male that retains its testicles is called a stallion. When it is intended for breeding, it is called a stud or sire. The behavior of an entire horse is marked by hormonal activity: it tends to be more territorial, energetic, and reactive to mares, which requires expert handling and appropriate facilities. For this reason, most males not used for breeding are castrated (then called geldings), which makes them much more manageable and suitable for companionship and sport.


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