Soja desativada em dietas com diferentes proporções de concentrado para terminação de cordeiros confinados

Abstract

In order to evaluated the performance, growth and development of the body components of feedlot lambs fed diets with different levels of Brachiaria brizantha cv BRS Piatã hay and concentrate containing soybean in nature or inactive soybean. Twenty non-castrated male lambs were used without defined breed, with 22.60 kg of body weight and randomize in four diets were a function of the inclusion of in nature or inactive soybean and proportion of Piatã hay (20 and 50%). The experimental diets contained: 50% of concentrate with inactive soybean and 50% Piatã hay; 80% of concentrate of inactive soybean and 20% of Piatã hay; 50% of concentrate with in nature soybean and 50% Piatã hay; 80% of concentrate of in nature soybean and 20% of Piatã hay. The variance analyses of data did not show effect of interaction, between the levels of inclusion of piatã-grass and the soybean processing in the feed diet on performance, growth and development of body components of lambs, therefore, these factors were separately analyzed. There are differences between the levels in inclusion of Piatã hay in diet. The lambs receiving 20% of inclusion of hay showed high gain of body weight and greater feed conversion and smaller full small intestine and large intestine than those who received 50% Piatã hay. The lambs fed with inactive soybean remained less 10 days in feedlot, showed lower percentage of kidney fat and inguinal fat and it was the most homogeneous finishing and greatest feed conversion (4:1), in relation the lambs fed with diet containing in nature soybean (6:1). We concluded that finishing lambs fed with 20% of Piatã hay and inactive soybean showed greatest performance and lower percentage of small and large intestine.