<P> Other than the few bulls needed for breeding , the vast majority of male cattle are slaughtered for meat before the age of three years , except where they are needed ( castrated ) as work oxen for haulage . Most of these beef animals are castrated as calves to reduce aggressive behavior and prevent unwanted mating , although some are reared as uncastrated bull beef . A bull is typically ready for slaughter one or two months sooner than a castrated male or a female , and produces proportionately more , leaner muscle . </P>
what are bulls used for on a farm
breeding slaughtered for meat work oxen for haulage