Dear of troy: Selective breeding has made very marked differences between dairy cattle and beef cattle. You'd go broke trying to sell meat from dairy animals, or milk from beef animals. Peculiarly there is an important difference between dairy bulls and beef bulls. My uncle, a dairyman, warned me in very strong terms, never to trust a dairy bull, which may attack savagely with no warning. So I was horrified when we went to a beef farm to see a bull to have my daughters beef cow bred. The girl who owned the bull came up out of the pasture riding on the bull's back. When I questioned her, she told me about the difference.We later owned a big Herford bull, and he was a gentle lovable pet.But I later met a dairyman horribly disfigured by one of his bulls because he go carelss. With artifical insemination, few dairfarmers want to have the problems of keeping a bull.