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The main objective of this work was to evaluate the live weight components in ram lambs or in lambs castrated by burdizzo pincers, rubber bands or knife, and slaughter at 30 kg of live weight. Castration was done at the average age of 58 days. Lambs were weaned at the average age of 84 days and immediately confined in collective pens. The animals belonged to three genetic groups, Hampshire Down x Corriedale, Ile de France x Corriedale and Suffolk x Corriedale. There was no interaction (P>.05) between treatment and genetic group. There was no difference in hot carcass yield and weight among ram and castrated by different methods lambs, and among the different genetic groups. Weight and percentage of liver were the only differences observed among treatments, where ram lambs presented greater means. It was also observed that Suffolk lambs presented greater weights and percentages of kidney, liver, spleen and digestive tract, and the Ile de France lambs presented lower percentages of lungs and trachea. It can be concluded that when the animals are slaughter with 30 kg of weight, there are no important quantitative differences in live components between ram and castrated lambs, however differences in live weight components can occur among different genetic groups.

Componentes do peso vivo em cordeiros inteiros ou submetidos a diferentes métodos de castração