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.
1 Weight of typical mature cow: -380 kg to 450 kg. 2  Steers reared on grass: - ready for slaughter between 3 to 3.5 yrs36 -42 months) 420-460 kg. 3  Steers, supplementary fed: -ready for slaughter between 18 to 22months @ 380 to 400 kg.