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.
