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Yearling Bulls Shorten The Duration Of Postpartum Anestrus In Beef Cows To The Same Extent As Do Mature Bulls, Andrea S. Cupp, M. S. Roberson, T. T. Stumpf, M. W. Wolfe, L. A. Werth, N. Kojima, Roger J. Kittok, J. E. Kinder
Yearling Bulls Shorten The Duration Of Postpartum Anestrus In Beef Cows To The Same Extent As Do Mature Bulls, Andrea S. Cupp, M. S. Roberson, T. T. Stumpf, M. W. Wolfe, L. A. Werth, N. Kojima, Roger J. Kittok, J. E. Kinder
Department of Animal Science: Faculty Publications
The objective of this study was to determine whether yearling bulls, when pastured with cows, reduced the duration of postpartum anestrus to the same extent as did mature bulls. This experiment was conducted over a 3-yr period. Cows were stratified by parity group to achieve 37% 2-yr-old and 63% mature (> 2-yr-old) cows within each treatment group (approximately 50 cows per treatment per year). Cows were assigned in the order in which they calved to one of three treatment groups: 1) isolated from bulls (NBE; n = 158); 2) exposed to mature bulls that were z 3 yr of age …