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.
Principle 2âIt is important to properly feed cows so. that they can show estrus early in the breeding period. Table 2 shows that cows that display estrus within the. first 21 days of breeding have higher pregnancy rates. compared to cows displaying estrus after the first 21.