In “selection” process of cattle, the selected animals of the breeding population are mated with superior animals of the same breed which are unrelated to the breeding population. It helps in restoring fertility and yield. Superior cows and superior bulls of the same breed are identified and mated. The progeny obtained from such mating are evaluated and superior males and females are identified for further mating. A superior female, is the cow that produces more milk per lactation. On the other hand, a superior male is the bull, which gives rise to superior progeny as compared to those of other males.