A putto is often called a cherub (plural cherubs) although unlike the Biblical cherub (plural cherubim) in form and symbolism: cherubim have four faces of different species and several pairs of wings, and are sacred, whereas putti are secular and represent a non-religious passion.
(The term stallion for an uncastrated male horse dates from this time; stallion = stalled one.) Stallion is also used to refer to males of other equids, including zebras and donkeys.
A gelding is a castrated male horse, donkey or mule. Unless a horse is to be used for breeding purposes, it should be castrated. Gelding can make horses more even tempered and easier to handle. A stallion who is gelded later in life may retain more aggressive stallion-like behavior. A colt may be gelded before it is one year old -- as soon as the testicles descend into the scrotum.