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.
Normally, a cow is bred to give birth to a calf every year, at which time she will begin and continue to produce milk for a period of up to 12-15 months. Production peaks about two months after the calving date. Some 60 to 90 days after calving, the cow will be rebred for her next calf.e milk the cows robotically, which allows a cow to choose how often (typically three times a day) she wishes to be milked. The average cow produces approximately 54 lbs. of milk per day (about 7 gallons).