Eficiência das enzimas amilase, protease e xilanase sobre o desempenho de frangos de corte

Abstract

This experiment was undertaken to determine the effect of one multienzimatic complex by using amilase, protease and xilanase suplemented in the corn and soybean meal based diets on the performance of broiler chickens. Eight hundred and nineteen broiler chicks were utilized. The chickens were distribuited in a 13 (thirteen) treatments with three replicates and 21 chickens in a plots . The experimen was in a completely randomized bock design, in a 3 x 2 x 2 + 1 additional factorial. The treatments studied were: corn + soybean meal-based diets with normal levels of nutrients without enzymes and others 12 treatments with normal and reduced levels (3% in the growth phase and 5% in the final phase) of energy and/or protein, with addition of 0.5; 1.0 and 1.5 g/kg of diet of the multienzimatic complex. The parameters evaluated were weight gain, feed intake, feed conversion, european productive efficiency index, carcass yield and abdominal fat yield. The results showed better performance for those broiler fed diets suplemented with enzymes, wich shown increase of the weight gain and improvement in the feed conversion at 28 days old maily for diets with 1.0 g/kg of enzyme as well as for the european productive efficiency index. Therefore broilers at 42 days old , the addition of enzymes in the diets shown no effects on european productive efficiency index, carcass yield as well as the abdominal fat yield in the chickens.