SUPLEMENTAÇÃO DE FITASE EM DIETAS COM REDUÇÃO NOS NÍVEIS NUTRICIONAIS PARA CODORNAS DE CORTE

Abstract

The experiment was conducted to evaluate the effects of phytase supplementation on diets with reduced levels of available phosphorus, calcium, digestible amino acids and metabolizable energy for quail meat-type. A total of 680 birds were used, from 1 to 45 days-old, distributed in a completely randomized design in five treatments with eight replicates of seventeen birds. The treatments consisted in five phytase levels (0, 500, 1,000, 1,500 and 2,000 FTU kg-1) supplemented in a basal diet with a reduction of 0.15% in available phosphorus, 0.15% in calcium, 10% in digestible amino acid levels (metionine+cystine, lysine and threonine) and 25 kcal/kg in the metabolizable energy. The data were analyzed through the polynomial regression, considering significant differences when P≤0.05. Phytase levels did not influence feed intake or viability (P> 0.05). In contrast, they influenced in a quadratic (P=0.014) the weight gain and feed conversion (P=0.004) of the birds, where better supplementation levels can be estimated at 1,110 and 1,000 FTU kg-1, respectively. It is concluded that phytase supplementation improves the performance of quail meat-type receiving diets with reduced levels of available phosphorus, calcium, digestible amino acids and metabolizable energy, indicating supplementation of 1,000 FTU kg-1.