Winter Grazing System and Supplementation of Beef Cows During Late Gestation Influence Heifer Progeny

摘要

Effects of cow winter grazing system and supplementation on heifer progeny were evaluated. Cows grazed range (WR) or corn residue (CR) with (PS) or without (NS) supplement. Both PS and CR increased weaning weight. Heifersfrom WR-NS dams weighed less at breeding and pregnancy diagnosis than WR-PS. Heifers from PS dams were younger at puberty, and pregnancy rate tended to be greater. Heifers from CR-PS dams gained the least and were least efficient. First-calf production and rebreeding were similar. There appear to be fetal programming effects of dam winter grazing system and supplementation on heifer progeny.