Carcass characteristics of lambs fed diets containing soybean disabled or fresh

Carcasses characteristics and tissue composition of 20 crossbred male lambs, not castrated, 120 days old, and initial body weight of 22.6 +/- 2.06 kg were evaluated. The feedlot diets were composed with whole or disabled soybean and 50% or 80% of concentrate levels. The slaughter criterion was the body condition 3 (normal) to 3.5 (slightly greasy). The completely randomized design was used, allocated in 2x2 a factorial arrangement (processing of soybean grain and levels concentrate). The real yield was lowest among the animals fed diet with 50% concentrate containing in natura soybeans. Diets with 80% of concentrate level influenced (P <0.05) the cold carcass weight (15.63% x 14.27%), hot carcass yield (47.14% x 45.46%), cold carcass yield (45.97% x 44, 13%), texture in Longissimus dorsi muscle (4.44 x 3.85) and greater muscle weight (3.878 kg x 3.411 kg). Carcasses of animals fed diets containing 50% concentrate had (P <0.05) greater cooling weight losses (2.97% x 2.49%). Diets containing soybean disabled influenced (P <0.05) cold carcass yield (45.77% x 44.14%), texture in Longissimus dorsi muscle (4.35 x 3.89) of the muscle: bone ratio (2.90 x 2.65). A diet with 80% concentrate containing grain and soy disabled positively influenced the characteristics and tissue composition of carcasses from feedlot lambs.