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.
When a cow calves 10 days or two weeks late (and has a big calf and a hard birth), sheâs losing that amount of time to recover and rebreed. So I started looking for bulls that sired calves with shorter gestation so I could get my cows bred back on time,â he says.attle with long gestation lengths generally give birth to large calves, since the fetus is growing fastest at the end of gestation. A 278-day gestation usually results in a smaller, lighter calf (in the same breed and type of animal) than a calf carried 288 days or longer.