Application of body mass index in screening of cows and cows with high reproductive performance and breeding of cows

The invention discloses application of a body mass index in screening of high-reproductive-performance cows and cows or breeding of the cows, the body mass index is body weight/body height 2 or body weight/body height 3, and the body height is the vertical distance from the highest point of astragalus membranaceus to the standing ground of the cows. The invention discovers that when the body mass index calculated according to the body weight/body height 2 is 275.50-341.10 kg/m < 2 >, the conception rate after artificial insemination of female and dairy cow individuals is high, and the body mass index is associated with high-reproductive-performance female and dairy cow screening and dairy cow breeding for the first time; the high-reproductive-performance female and dairy cow screening method or dairy cow breeding method provided by the invention is high in accuracy, strong in operability, low in cost and simple in determination, and can be effectively applied to small and medium-scale dairy farms. 本发明公开了体质指数在