In the terminology used to describe the sex and age of cattle, the male is first a bull calf and if left intact becomes a bull; if castrated he becomes a steer and in about two or three years grows to an ox.The female is first a heifer calf, growing into a heifer and becoming a cow.Depending on the breed, mature bulls weigh 450–1,800 kg (1,000–4,000 pounds) and cows 360–1,100 kg (800