They begin to lose this coloring in about four months. The gestation period is nine months and calves weigh in at about thirty-five pounds at birth. Newborns forage within twenty four hours and can swim within two hours of birth. They mature in about two years. Cows who birth yearly usually birth until thirty or more years old.
Cows weigh about a half-ton, while the bulls weigh half again to twice as much.
They can see about as well as domestic cows but don't do well at all at night. And, much like domestic cattle, they become accustomed to the voices of their care givers and the source of their food. I've been told that bulls won't even protect their group, I'm not sure that I totally believe this due to experience. But I will say that the female is probably the most aggressive, especially toward her calves. A mother will tend her calves for two years, thus there may be calves of more than one age close by.