Most form pairs during the breeding season, but in some species, such as fur seals, the gray seal (Halichoerus grypus), and elephant seals, males (bulls) take possession of harems of cows and drive rival bulls away from their territory.
Look for the crooked tail. This is probably the best ways to tell if a cow has been bred: A cow or heifer will have a crooked tail or a tail that is held out in an odd angle than usual for 24 to 48 hours after being serviced by the bull. 1  4 Edit step.
To maintain lactation, a dairy cow must be bred and produce calves. Depending on market conditions, the cow may be bred with a dairy bull or a beef bull.. Female calves (heifers) with dairy breeding may be kept as replacement cows for the dairy herd.If a replacement cow turns out to be a substandard producer of milk, she then goes to market and can be slaughtered for beef.o maintain lactation, a dairy cow must be bred and produce calves. Depending on market conditions, the cow may be bred with a dairy bull or a beef bull.. Female calves (heifers) with dairy breeding may be kept as replacement cows for the dairy herd.