Efeito dos níveis de concentrado sobre os desempenho, características de carcaça e componentes não carcaça de ovinos Morada Nova em confinamento

Abstract

The study was conducted at Sheep and Goats Sector of the Departament of Animal Science of the Federal Rural University, Recife – Pernambuco – Brazil. Were evaluate performance, nutrients intake and digestibility, carcass characteristics and non carcass components in thirty two males castrate Morada Nova hair sheep breed, in feedlot, feeding with differents levels of concentrate in the diet 20, 40, 60 and 80%. The age and initial live weight was 8,11 ± 1,15 and 19,67 ± 2,97 kg, respectively, and slaughter weight of 30,0 kg. A blocks randomized design, with eight replicates, was used. The concentrate level above 60% of concentrate increasing performance of the Morada Nova hair sheep in feedlot, with elevation of daily weight gain and decreasing of time for reach slaughter, that to change from 52,50 to 123,37 days. Diets above 40% of concentrate increasing the digestibility index, however ether extract digestibility decreasing to start 61,45%, while nonfibrous carbohydrates to start 73,15% of the concentrate level in the diet. In relation to carcass characteristics, the concentrate levels increasing empty body weight, weight and yield cold carcass, but the shoulder, loin, leg cuts and body and carcass measurements were relationed with slaughter weight. The lows weights and yields of carcass were because of the high components non carcass weights. The weight slaughter was representative for organs, viscera and by-products weights in relation to concentrate levels, except liver, omasum, small intestines, blood and paws. Independet of the concentrate levels, the yields and weights of the non carcass components were high, with values that reflect in less yields and weights of carcass of the feedlot Morada Nova hair sheep.