A stud farm or stud in animal husbandry is an establishment for selective breeding of livestock. The word "stud" comes from the Old English stod meaning "herd of horses, place where horses are kept for breeding".

What is stud colt?

A very young horse may be called a "filly foal" or "colt foal." When a colt is weaned, it may be called a "weanling colt," and when it reaches the age of one, it may be called a "yearling colt" (or simply "yearling"). You might hear a colt over the age of one or two called a "stud colt."

When can a stud colt breed?

Although most stallions begin to produce sperm as early as 12 to 14 months, most are at least 15 months or older before they can successfully breed. Few stallions are used at stud before two years of age and most stallions acquire full reproductive capacity at around three years of age.