<P> A nose ring is a ring made of metal designed to be installed through the nasal septum of domestic cattle, usually bulls . Nose rings are often required for bulls when exhibited at agricultural shows . There also is a clip - on ring design used for controlling other cattle for showing or handling . Nose rings are also used to prevent pigs rooting, and to encourage the weaning of young calves and other livestock by discouraging them from suckling . </P> <P> Historically, the use of nose rings for controlling animals dates to the dawn of recorded civilization . They were used in ancient Sumer and are seen on the Standard of Ur, where they were used on both draught cattle and equines . </P> <P> The nose ring assists the handler to control a dangerous animal with minimal risk of injury or disruption by exerting stress on one of the most sensitive parts of the animal, the nose . Bulls, especially, are powerful and sometimes unpredictable animals which, if uncontrolled, can kill or severely injure a human handler . </P> <P> Control of the bull may be done by holding the ring by hand, looping a piece of rope through it, clipping on a bull staff . A rope or chain from the ring may be attached to a bull's horns or to a head - collar for additional control . </P>

Why do some bulls have rings in their noses