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.
Knowing if a cow or heifer is pregnant can determine your bottom line, which is dependent on the sexuality of the cow.and thus is important to your breeding operation. Open cows, or non-pregnant cows, are considered free-loaders because they get away with eating the feed you give them but give nothing in return.ow to Know when a Heifer or Cow Is Ready to Be Bred. How to. Know when a Heifer or Cow Is Ready to Be Bred. How to Tell when a Cow or Heifer Is in Estrus. How to. Tell when a Cow or Heifer Is in Estrus.