Reproductive performances of beef heifers mated at 14 months of age (14M), at 24 months of age (24M) and pluriparous cows (C), based on data from 4.012 animals were evaluated. The reproductive disorders were 19.3%, 11.6% and 7.6%, respectively, at 14M, 24M and for C; 14M was different from C (P<0.01). The occurrence of dystocia was 20.7%, 5.1% and 0.8% for the 14M, 24M and C, respectively. The 14M group was different from C (P<0.01). The mortality caused by dystocia was higher for 14M group 7.4% than for the C group 0.4% (P<0.01), respectively. The reconception rate was higher for the 14M (85.3%) and V (81.1%) than for the 24M group (70.7%) (P<0.01). The category which concentrated the parturition in the first period (until 09/19) (52.3%) was the 24M. Animals mated earlier tended to show high reproductive disorders and incidence of dystocia.
bovine; mating; reproductive performance mating; dystocia
