Composição química e valores de energia metabolizável de ingredientes alternativos para frangos de corte

Abstract

An experiment was conducted to determine the chemical composition and apparent metabolizable energy (AME) and AME corrected for nitrogen (AMEn) of three types of cottonseed meal (CM): CM extruded, CM by solvent extraction with husk and CM with 40% crude protein (CP), two varieties of sorghum and hominy feed. AMEn values of CM and sorghum from the existing literature were used to create prediction equations using chemical composition. Male Ross broilers at 14 days of age (n=210) were used in a metabolism assay and housed in metabolism cages in groups of five animals with six replicates per treatment. A reference diet (RD) and six test diets containing the ingredients under evaluation replacing 40% of RD constituted the set of established treatments. The chemical composition of the ingredients was as follows: 92.92, 91.80, 89.08, 86.44, 87.19 and 88.50% for dry matter, 32.96, 35.11, 40.50, 9.83, 8.17 and 10.80% for CP, 17.81, 1.03, 3.59, 2.27, 2.67 and 12.90% for ether extract (EE) and the values of AMEn were 2977, 2793, 2827, 2766, 3117 and 3017 kcal/kg, respectively, for extruded CM, CM with hulls, CM with 40% CP, IPA sorghum, Dow sorghum and hominy feed. The established AMEn equation for CM was -9,158.67 + 1,106.94*CP - 12.05*CP*CP - 1,866.99*Ash + 100.16*Ash*Ash - 834.01*Crude Fiber (CF) + 30.43*CF*CF and for sorghum was 4,365.59 + 175.41*CP - 10.35*CP*CP - 99.55*EE + 525.34*Ash - 85.06*Ash*Ash - 1,310.47*CF + 251.61*CF*CF. AMEn values of one sorghum and one CM type did not adjust to the prediction equations established.