Farelo residual de milho na alimentação de frangos de corte

Abstract

The objective of this work was evaluate the inclusion of increasing levels of residual corn bran (FRM) in broiler diets, on performance characteristics, carcass and main cuts yields and organs weight. Two hundred and seventy broilers of Cobb-500 lineage, males, from eight to forty-two days old, were housed in 30 boxes and distributed in a randomized block design (DBC) with five treatments and six replications containing nine birds per plot. The treatments consisted of FRM increasing levels (0, 13, 26, 39 and 52%) in the diet. Feed intake, weight gain and feed conversion in initial (8 to 21 days), growth (22 to 35 days) and final (36 to 42) phases and cumulative phases (8 to 35 days, 22 to 42 days and 8 to 42 days) were evaluated. At age of 42 days two broilers, with weight closest to the average weight of each plot, were slaughtered for evaluation of carcass characteristics, main cut yields and organs weight. Quadratic effects were observed for the 21 days average weight, weight gain and feed conversion ratio in the initial phase, with optimal inclusion levels of 9.14, 9.05 and 19.5%, respectively. The same effect was observed in the growth phase in the middle weight and feed conversion to 35 days, with optimal levels of 10.58% and 12.75%, respectively. However, at the highest level of inclusion there was negative effect on performance, according to test of Dunnet. There was no effect of the treatments on the final stage. Quadratic effect was observed for drumstick yield with minimum point at 28% inclusion of FRM. There was increasing linear effect to gizzard weight. According to Dunnet test there was treatment effect for weight and gizzard parameters, in the higher levels of inclusion of FRM. Considering all trial period it was observed that FRM maximizes performance of broilers, showing better than the control diet, at 13% inclusion level.