Domesticated
Depending on the breed, mature bulls (fertile males) weigh 1,000–4,000 lbs (450–1,800 kg); cows (fertile females) weigh 800–2,400 lbs (360–1,080 kg). All modern cattle are believed to belong to either of two species ( Bos indicus or B. taurus ) or to be crosses of the two. About 277 identifiable breeds include those prominent in beef production (e.g., Angus , Hereford , and shorthorn ) and dairy farming . Cattle feed primarily by grazing on pasture, but in modern farming their diet is ordinarily supplemented with prepared animal feeds . See also {{link=aurochs">aurochs , Brahman , ox .