Abstract
Pregnancy rates, determined by per rectum palpation, were analyzed with respect to cow parity (range 1 to >8 calvings) and body condition score (BCS, 1=thin to 9=fat) at pregnancy examination for 3734 beef cattle females on 3 commercial beef operations (8 herds) in 3 Florida counties in 1989 and 1990. The means and standard deviations for the herds were the following: pregnancy rate, 81.3 ± 39% (range 62.1 to 91.5%); BCS, 4.7 ± 0.6 (range 4.3 to 4.9); and parity, 3.9 ± 2.3 (range 2.8 to 4.8). Significant associations were found between pregnancy rate, parity, BCS and herd (P < 0.001); and between the variable interactions, parity with BCS, herd with BCS, and herd with parity (P < 0.001). Cows with a BCS ≤4 had a pregnancy rate of 59%; those with a BCS ≥5 had a pregnancy rate of 90%. Cows having a parity of