Determinação dos valores energéticos e da composição química do resíduo seco de fecularia para frangos de corte

Abstract

espanolO objetivo do trabalho foi determinar os valores energeticos e a composicao quimica do residuo seco de fecularia (RSF) para frangos de corte. Os tratamentos foram distribuidos em um delineamento experimental inteiramente casualizado, em um esquema fatorial 2x5, constituidos de dois sexos e cinco niveis de inclusao do RSF (0; 10; 20; 30 e 40%), totalizando dez tratamentos e quatro repeticoes, com quatro aves por unidade experimental. O periodo experimental teve duracao de dez dias, sendo cinco dias de adaptacao e cinco de coleta de excretas. As amostras de excretas, racoes e RSF foram secas em estufas de circulacao forcada de ar a 55oC. A composicao bromatologica para o RSF foi de 89,86% de MS, 0,98% de PB, 3519 kcal kg-1 de EB, 0,19% de EE, 27% de FDN, 19,5% de FDA, 0,33% de calcio, 0,43% de fosforo, 0,46% de potassio, 0,12% de magnesio, na materia natural. Os valores medios de energia metabolizavel aparente (EMA), EMA corrigida pelo balanco de nitrogenio (EMAn), coeficiente da EMA (CMA) e coeficiente da EMAn (CMAn) do RSF, na materia natural, foram de 1598 kcal kg-1, 1605 kcal kg-1, 45,42% e 45,61%, respectivamente. De acordo com as equacoes o valor de EMAn encontrado pode variar de 1789 kcal kg-1 a 1808 kcal kg-1. EnglishThe objective was to determine the energy values and the chemical composition of dry residue of cassava (DRC) for broiler chickens through two methodologies. The treatments were distributed in a completely randomized design in a 2x5 factorial arrangement, with two sexes and five levels of inclusion of RDC (0, 10, 20, 30 and 40%), totaling ten treatments and four replicates, with four birds each. The experimental period lasted ten days, five days of adaptation and five excreta collection. The samples of excreta, feed and DRC were dried in forced circulation greenhouses air at 55 °C. The chemical composition for the DRC was 89.86% DM, 0.98% CP, 3519 kcal kg-1 EB, 0.19% EE, 27% NDF, 19.5% ADF, 0.33% calcium, 0.43% phosphorus, 0.46% potassium and 0.12% magnesium, in the natural matter. The mean values of apparent metabolizable energy (AME), AME corrected for nitrogen balance (AMEn) AME coefficient (CAME) and coefficient of AMEn (CAMEn) of DRC in natural matter were 1598 kcal kg-1, 1605 kcal kg-1, 45.42% and 45.61%, respectively. According to equations the AMEn value found may vary from 1789 kcal kg-1 to 1808 kcal kg-1.