Recombinant bovine somatotropin (rbST) and breed group in reproductive precocity of female goats

Abstract

The aim of this study was evaluated the effect of rbST and breed group on the reproductive precocity of goat females. It was used 18 females of three breed groups (GR), being 6 Alpine, 6 ½ Boer x ½ Alpine (½ BA) and 6 ¾ Boer x ¼ Alpine (¾ BA), distributed in two treatments: 1 compound of 9 goats, which received received rbST and 2, compound by 9 goats control. The train of the development of females was made by weighed weekly until reaching the previously definitive weight of 30 kg of live weight (LW). For evaluation of the reproductive performance it was made observations of the signals related to the oestrus. The characteristics evaluated was: weight gain at born until weaning, weaning at 120 days, 150 and 180 days of age, weight to the oestrus, age to the rutting and the 30 age to kg of LW. It was not observed influence of growth hormone and the breed group for weight to rutting, age to rutting and age to reach 30 kg LW. The use of rbST in growth females did not modify the parameters of sexual precocity.