Dietas à base de farelo de trigo e de milho, suplementadas com xilanase e fitase, sobre o desempenho e qualidade de ovos de codornas japonesas

Abstract

The objective of this study was to evaluate the use of basal diets composed of corn and soy and wheat and soy, supplemented with xylanase and phytase on the performance and quality of eggs of Japanese quails. Four hundred and forty-eight Japanese quails, at 136 days old were used, distributed in a completely randomized design with 8 treatments, 7 replications and 8 birds in each experimental unit, with a 2 x 2 x 2 factorial scheme for two dietary bases (Corn+Soybean and Wheat+Soybean), two xylanase levels (0 and 16000BXU/kg) and two phytase levels (0 and 2000 FTU/kg). The parameters evaluated for performance were: Feed Consumption (CR), Egg Production (PR), Egg Weight (PO), Egg Mass (MO), Conversion by Egg Mass (CMO) and Conversion by Dozen Eggs (CDZ). For internal and external quality: yolk height (AGEMA), albumen height (AALB), yolk weight (PGEMA), yolk percentage (PRGEMA), albumen weight (PALB), albumen percentage (PRALB), shell percentage (PRCASCA), haugh unit (UH) and specific gravity (GE). Data were subjected to analysis of variance and means were compared by Tukey test at 5% significance level. There was an interaction between base, phytase and xylanase supplementation for MO and CMO in which birds supplemented with xylanase and phytase had lower MO compared to the other treatments. Birds that did not receive phytase in the diet had higher values for CR and PR and lower values for CDZ. Regardless of xylanase supplementation, birds that received corn in the diet had higher PR. When supplemented with xylanase, birds had heavier eggs on corn-based diets. For variables shell percentage (PRCASCA), shell thickness (ESPCASCA), showed an isolated effect of the dietary base (p ≤ 0,05), in which corn-based diets caused heavier and thicker shell. The corn-based diet showed better results compared to wheat. The enzymes utilization did not improve the use of diets by the birds.