Abstract

We used 76 cows to determine the effect of inseminating at different times after detecting estrus and to evaluate Synchronization B as an estrus synchronizing agent. Cows were divided into five groups: (1) nonsynchronized bred naturally; (2) nonsynchronized bred once a day approximately 12 to 24 hours after detecting estrus; (3) nonsynchronized bred twice a day approximately 12 hours after estrus; (4) synchronized bred once a day, and (5) synchronized bred twice a day. Synchronizing did not affect conception rate with twice-a-day breeding, but did with once-a-day breeding. Conception rates during the first 25 days of the breeding season were 63.6, 70.0, 69.2, 40.0, 80.0 for groups 1 through 5, respectively.

Keywords: Report of progress (Kansas State University. Agricultural Experiment Station), 291, Cattlemen's Day, 1977, Beef, Synchronization, Estrus, Conception rates

How to Cite:

Heekin, M., Kiracofe, G., Schalles, R. & Ward, H., (1977) “Synchronization of estrus and insemination time in beef cows”, Kansas Agricultural Experiment Station Research Reports 1(1), 3-5. doi: https://doi.org/10.4148/2378-5977.2665