Desempenho a componentes do peso vivo de cordeiros submetidos a diferentes sistemas de alimentacaoPerformance and live weight components of lambs submitted to different feeding systems

摘要

The aim of the present study was to evaluate the weight gain, carcass characteristics and live weight components front the lambs subjected to different feeding systems. Twelve lambs, castrated males, of no specific breed, were used and divided in three different treatments: 1- Confinement; 2- Supplementation in native pasture; 3- "Creep-feeding". The lambs presented in an average 95 days old, when then, eight lambs had been weaned and the others four remained with the mothers. After the weaning, the lambs were distributed in the respective treatments, being that in treatments 1 and 2, the lambs weaned arid in treatment 3 had been used not weaned. The slaughtering occurred when the lambs were an average of 164 days old. After each slaughtering, the carcass and the body parts of the animals were weighed individually. Afterwards, the percentage in relation to the live weight was calculated. The data found for this experiment have not shown effect from the feeding systems tested (P>0.05) on the variables studied. Visceras full and the skin is the components of the live weight of bigger relative importance, representing in average 23.55% and 10.88%, respectively. The weight gain, carcass characteristics and components of the live weight are similar between lambs when weaned and confined, weaned and supplemented in native pasture or fed to the foot of the mother in system of creep feeding.