The objective of this paper was to evaluate the effect of sex on commercial characteristics and tissue composition (percentage of bones, muscles and fat ) of the carcass of lambs fed in feedlot and slaughtered after 100 days of age. Eighteen lambs (6 uncastrated male sheep, 6 castrated sheep and 6 ewe) sons of the ram Texel with crossed ewe (Texel and Ideal), that were bordered on close to their mothers twenty four hours after birth until 50 days of age, were used. After being separated of their mothers, they were kept alone up to 100 days of age and then slaughtered. The values found for weight when alive, weight after slaughter, weight of cold carcass and of warm carcass, back area, thickness of fat, income of the cold carcass and of the warm one, rate of break after getting cold and the percentage of bones, muscles and fat in the carcasses did not defer despite the sex of the lambs. It became evident that the rams, castrated sheep and ewes have the same performance and quantitaive characteristics of carcass when fed under the same conditions and slaughtered after 100 days of age.
sheep; carcass characteristics; tissue composition
