cattle gestation period wikipedia
The gestation period for a cow is about nine months long. A newborn calf's size can vary among breeds, but a typical calf typically weighs 25 to 45 kg (55 to 99 lb). Adult size and weight vary significantly among breeds and sex. In Australia, the term Japanese ox is used for grain-fed steers in the weight range of 500 to 650 kg that are destined for the Japanese meat trade. 2  In North America, draft cattle under four years old are called working steers.