Chemical composition and energetic values of different corn cultivar for poultry

Abstract

The aim of the present was determinate the values of apparent metabolizable energy (AME), AME corrected by nitrogen retention (AMEn), true metabolizable energy (TME) and TME corrected by the nitrogen retention (TMEn), its metabolizability coefficients, moreover, adjust prediction equations from experimental results and chemical composition of eight different corn cultivar originating from Copagril experimental station. The total excreta collecting method was used to determinate the energy values, where 160 broiler chicken Cobb, aging 21 days, were shared in a completely randomized blocks design. The experiment lasted 10 days, five of them for adaptation and the other ones for total excrements collecting. The energy values of the foods and excretas were determined using the calorimetric method. Significative differences were not observered (P>0,05) for metabolizability coefficients of corn samples. The AME, AMEn, TME and TMEn values varied of 3295 up to 3498 kcal/kg, 3227 up to 3416 kcal/kg, 3315 up to 3454 kcal/kg and 3235 up to 3424 kcal/kg, respectively. The prediction equations had not been adjusted adequately for energetic values, they demonstrated a low R2 value.