INFLUENCIA DE LA CONDICIÓN CORPORAL Y PRODUCCIÓN DELECHE SOBRE EL COMPORTAMIENTO REPRODUCTIVO DE VACASLECHERAS MESTIZAS

The influence of the body condition (CC) to the childbirth and the production of the milk before the 65 days, or before the first estrous pospartum, on the restart of the activity ovarian recurrent luteal (AOLC) and the number of silent estrous (ES), before the first behavior estro and period childbirth-first observed estro, they were evaluated to the beginning of the pospartum in 36 mestizo cows HxC. The cows were fed in different form in the prepartum period to settle down itt lists of body condition (ECC) among 2.0 ? 5.0 to the chidbirth, considering as ECC 2.0 ? 2.9 = low CC; 3.0 ? 3.9 =CC mediates ; and 4.0 ? 5.0 = CC discharge. In the xperimet a desing was used entirely at random, in factorial outline of 3x2, with tree categories of it lists corporal and two levels of production of milk, with six repetitions for group. The beginning of the AOLC was determined by the concentrations progesterona in serum (P4 > 1.0 ng/ml), in samples of blood collected starting from the childbirth until the seven days search observed estro. The numbers of silent estrus it was verified by the verification of levels of P4> 1.0 ng/ml during one period ? 7 days, without previous manifestation of behavior estral. The period first estro was determined twice by the visual observation of of the behavior estral a day, with aid of bulls markers. The interval leaves AOLC it was affected by the CC to the childbirth (P<0.05) beginniing 40.9; 44.2; and 24.4 days after the childbirth in the cows with low CC, mediates and high respectively, The restarts of the AOLC it was not affected by the production of milk (P>0.05), beginning 35.8 and 37.1 days pospartum in the cows with production of low milk <20 kg and high >20 kg it beging respectively. He numbers of silent estrus it didn't differ (P>0.05) among the categories of body condition to the childbirth. The period childbirth first estro was smaller (P<0.05) for the cows with CC discharge (29.0 days), not differing(P>0.05) when the CC was low and mediates (54.8 and 51.2 days). There was not difference (P>0.05) for the number of silent estrus among the categories of production of milk, however, the period of chidbirth to first estro was bigger (P<0.05) for the cows of more production - 50.0 and 40.1 days, respectively.