stud

noun

• A male animal, especially a stud horse (stallion), kept for breeding.
• A female animal, especially a studmare (broodmare), kept for breeding.
• (also by extension) A group of such animals.
• An animal (usually livestock) that has been registered and is retained for breeding.
• A place, such as a ranch, where such animals are kept.
• A sexually attractive male; also a lover in great demand.