Níveis de fósforo disponível e cálcio em rações suplementadas com fitase para frangos de corte nas fases de crescimento e final

摘要: Calcium and available phosphorus (aP) levels in diets with phytase for Cobb broilers the growing (22 to 35 days) finishing phases (36 42 days of age) were evaluated. A 3 × 4 + 1 factorial scheme, three aP (0.36, 0.31, 0.26% phase 0.33, 0.28, 0.23% phase), four calcium (0.82, 0.72, 0.62, 0.52% 0.76, 0.66, 0.56, 0.46% one level supplementation (500 ftu/kg) was used. Control not supplemented they contained, respectively, following calcium: 0.41 0.82% (growing phase) 0.38 0.76 (finishing phase). In performance assays, at age, feed intake, weight gain, conversion ash content tibia metabolic energy values (AMEn) dry matter digestibility coefficients (DMDC) determined. phase, reduction 0.52 0.26%, did compromise performance, bone ash, AMEn or MCDM. 0.56 0.28%, MCDM; addition improving ash. The diet can be reduced 0.28% provided that this is combined fitase 500 ftu/kg diet.