bull exposure, calving interval, reproductive performance, first-calf heifers
Ninety-four spring calving, first-calf heifers were allotted to one of two treatment groups, control or bull exposed, to study the effect of bull exposure early postpartum on rebreeding performance when bred by natural service. Bull exposure early postpartum had no effect on pregnancy rate. However, bull exposure unexpectedly increased the subsequent calving interval by 9 days (P<.05) and delayed the average calving date by 7 days (P<.05). Under the conditions of this study in which heifers were in condition score 5 or better at calving and bred by natural service, bull exposure early postpartum did not improve reproductive performance.
Number of Pages
South Dakota State University
Copyright © 1992 South Dakota State University.
Goehring, T. B.; Miller, H. L.; Quinn, C. R.; and Quinn, R. L., "Effect of Bull Exposure on Reproductive Performance of First-Calf Heifers Bred by Natrual Service" (1992). South Dakota Beef Report, 1992. 13.