Carboidrases em rações para frangos de corte

Abstract

The experiment was carried out in order to evaluate the effects of supplemental carbohydrases individually (α-amylase) or associated with the enzyme complex (α-galactosidase, galactomananase, xylanase and ß-glucanase) in diets for broilers. The diets were formulated based on corn and soybean meal, with reductions in nutrient levels to evaluate the performance, carcass yield and economic viability of the use of enzymes. Were used 576 females chicks, Cobb lineage, distributed in a completely randomized design consisting of 4 treatments and 6 replicates of 24 birds put in each plot in conventional poultry house, in Guanambi-BA. The evaluation periods were 1 to 21, 1 to 35 and 1 to 42 days. The treatments were T1 = positive control diet T2 = negative control diet with 35 kcal reduction in the initial phase and 70 kcal / kg of feed for the growth and final phase T3 = diet reformulated with 300g/ton of exogenous amylase (isonutrient to T1) and T4 = diet reformulated with 300 g / ton of exogenous α-amylase + 200 g / ton of carbohydrases enzyme complex (isonutrient to T1). The nutritional matrix of the amylase exogenous in the diet was 116,67 kcal / kg in the initial phase and 233,34 kcal / kg in the growth and final stages. The nutritional matrix of the amylase exogenous in the diet T4 was 116,67 kcal / kg in the initial phase and 200,00 kcal / kg in the growth and final stages. There was appreciation of the ingredients corn and soybean meal at 1.5 and 6% in AMEn, and 2% respectively limiting amino acids for both ingredients. The negative control diet, the positive control one and the diet containing only exogenous amylase. did not make difference on performance. The use of enzyme complex compoound of α-galactosidase, galactomananase, xylanase and ß-glucanase associated with exogenous enzyme α-amylase worsens performance and generates the same economic response in the production of broilers, without changing the carcass and cuts yield.