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.
A cow's gestation period is approximately nine months. If know your cow's insemination date and the cow has calved before, there's a good chance she'll give birth after the same number of days as before. Aside from that, many physical clues can help you tell when birth is imminent. As your cow's ...