Carcass characteristics of sheep fe d diets with slow-release urea replacing conventional urea
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Universidade Estadual de Maringá
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This study aimed to evaluate the effects of addi ng slow-release urea to replace conventional urea in the diet on carcass characteristics of feedlo t sheep. We used 20 Santa Ines x SRD rams, with average body weight of 21.1±1.2 kg and average age of 120 da ys, distributed in a comple tely randomized design with 5 treatments. The replacement levels used as tr eatments were 0, 20, 40, 60, and 80%, composing diets of about 12% crude protein, with 50 % Tifton-85 ha y and 50% concentrate. There was no influence of slow release urea on weight at slaughter (35.17 kg ), and on hot (16.75 kg) and cold (16.24 kg) carcass weight, but the yield of these carcasses showed quad ratic trend, revealing lower percentages at 48.5 and 47.63% replacement levels, respectively. The weights an d yields of cuts did not change, except for the posterior arm, whose values showed a cubic trend. Objective measures of carcass, loin eye area, and subjective evaluations of confor mation, finishing and marbling of carcasses were not affected. The subcutaneous fat thickness decreased linearly (4.25 to 2.48 mm). The inclusion of slow release urea in the diet changes the yield and reduces subcutaneous fa t, however, it does not influence other carcass characteristics.
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