Características produtivas de cordeiros terminados em confinamento com dietas contendo diferentes teores de borra de soja

Abstract

We evaluated the nutrient intake, weight gain, carcass characteristics and the non carcass components of lambs in feedlot finishing diets containing increasing levels of soybean soapstock. We used 25 male lambs, castrated Texel, randomly distributed into five treatments consisting of proportions of 0%, 2.89%, 5.77%, 8.65% or 11.55% of soybean soapstock in the dry matter this diets. Linear reduction of nutrient intake was observed, with the exception of the consumption of ether extract, which increased linearly. The live weight at slaughter, the daily weight gain, the weights and yields from hot and cold carcass and the weights of hindquarter and rib decreased linearly, while the proportions of rumen and gastrointestinal tract, full and gastrointestinal tract content increased in a linear way as it increased the proportion of level this soybean soapstock in the diet. The proportion of hindquarter varied in a quadratic way. The increase in soybean soapstock in the diet of lambs in confinement system leads to decrease in productive performance of animals. However, the daily profit obtained per animal is not affected, and we may infer that the inclusion of soybean soapstock to the level of 11.55% of the total dry matter of the diet is a viable alternative to termination of feedlot lambs.