<P> Spurs are also a source of controversy, though modern rodeo rules place strict regulations on the type and use of spurs and participants point out that they are a tool commonly used in other non-rodeo equestrian disciplines . Spurs used in bull riding do not have a fixed rowel, nor can they be sharpened . The PBR currently allows only two types of rowels to ensure the safety of the animals . </P> <P> Bull riding has the highest rate of injury to humans of any rodeo sport . It accounts for approximately 50% of all traumatic injuries to rodeo contestants, and the bullfighters have the highest injury rate of any non-contestant group . </P>

How long does it take for a bulls balls to fall off