Composição regional e tecidual de cordeiros terminados com dietas contendo grão de soja in natura ou desativado

Abstract

This study aimed to evaluate the regional composition of the carcass and tissue of shoulder and leg of lamb finished feedlot receiving diets containing in natura or disabled soybean grain and two levels of concentrate. We used 20 animals, male, not castrated and crossbred with 120 days of age and initial body weight of 22,6 28± 2,06 kg. The slaughter criterion was the body condition of 3 (normal) to 3.5 (slightly fat) on a scale from 1 (excessively lean) to 5 (excessively fat). After 24 hours the carcasses were cut in half, the left half longitudinally, was separated into eight commercial cuts, and the shoulder and leg were dissected to quantify the tissue composition of cuts. The completely randomized design was used, allocated in a factorial 2x2 (concentrate and processing of soybean grain). The shorter length of stay in days of animals in feedlot (38 days) was influenced by the diets containing soybean disabled. The composition regional of carcass was influenced by the level of 80% concentrated was to weight to the cut loin (0.800 kg). The tissue composition of the shoulder influenced by the level of 50% concentrate to yield subcutaneous fat (9.25%) and by diets containing soybean grain in natura weight for to subcutaneous fat and total fat (0.139 kg and 0.223 kg) and to yield subcutaneous fat (9.72%). The tissue composition of the leg was influenced by the diets containing soybean grain disabled yield for the muscle (61.23%) and muscle: bone ratio (3.22). In finishing lambs in feedlot diets containing soybean grain disabled have advantages in carcass quality compared to diets containing soybean grain in natura.