Desempenho, balanço e retenção de nutrientes e biometria dos órgãos digestivos de frangos de corte alimentados com diferentes níveis de proteína na ração pré-inicial

摘要: Two trials were carried out to evaluate performance, balance and retention of EE, DM CP biometrical measures digestive organs broiler chicks fed different dietary levels in the pre-starter period (1 - 7 d). In first experiment, 560 one-day-old Avian Farms allotted a complete randomized design with ten treatments, 5 x 2 (protein levels: 18, 20, 22, 24, 26% sex) factorial arrangement four replicates 14 birds each. second 1,860 Ross assigned 2.0 2.5 m experimental pens. This experiment was analyzed as design, five treatments level 26%) six replications 62 increasing did not affect but EE had linear positive effects according treatments. No treatment effect on protein observed, showed effect. significant differences observed for 4th fday improved pancreas relative weight. 2, it possible conclude that higher are indicated better results performance.