Exogenous enzymes in the performance and nutrient ileal digestibility of broiler chickens

Abstract

The objective of this work was to evaluate the effect on the performance and nutrient ileal digestibility of broiler chickens, of the phytase combination with the enzyme complex of amylase, protease and xylanase in corn-soybean meal diets, formulated with or without reduction in energy, calcium and phosphorus levels. The experimental design was completely randomized with factorial arrangement 2x2, with two control diets: with and without nutrient reduction, and two supplementations for each control (with and without addition of phytase and enzyme complex of amylase, protease and xylanase), with ten replicates of 40 chicks. The ileal digesta were collected in the 43^rd day of age, in order to determine digestible energy and digestibility coefficients of crude protein, dry matter, calcium and phosphorus. The performance showed interaction for all the parameters analyzed. The broilers fed with nutrient reduction showed inferior feed intake, body weight gain and feed conversion than those fed without nutrient reduction. There was no effect of enzymes and diet control on dry matter and calcium retention. The enzyme combination inclusion improved the protein digestibillity and phosphorus retention compared to control diet. There was interaction for digestible energy, with effects only in without nutrient reduction with best values in supplemented diets.