Bagaço de mandioca e complexo enzimático fúngico em dietas de frangos de crescimento lento

Abstract

The present work, divided in two experiments, was carried out in the poultry sector of the Federal University of Tocantins - Campus de Araguaína, with the objective of evaluating the inclusion of cassava bagasse with and without enzymatic complex in broiler diets slow in the periods of one to 30 days and 30 to 90 days of age. In the experiment I, 250 birds were used, Neck Red Pelado, with a day to evaluate the metabolizable of the diets and the zootechnical performance. In the second experiment, 250 birds, Neck Red Neck, with 30 days old were used to evaluate performance characteristics, carcass yield and noble cuts, biometrics of the digestive and lymphoid organs, chemical and physical characteristics of meat. The experimental design was completely randomized in a factorial scheme (2 X 2 + 1), with two levels of cassava bagasse inclusion (10 and 20%), presence and absence of the enzymatic complex and control diet, totaling five treatments, five replicates and ten birds per experimental unit. In the experiment I, birds fed a control diet had lower coefficient of metabolisability of crude protein when compared to birds fed diets containing cassava bagasse, regardless of the enzymatic complex. The metabolizable coefficient of the crude protein and the neutral detergent fiber of the diets with 20% of BM with enzymatic complex were superior to the treatment with 20% of BM without additive. It was observed that the inclusion of 10 and 20% of BM with enzymatic complex influenced (P <0.05) the feed intake, with lower values when compared to the control diet, however there was no effect (P> 0.05) on the weight gain, feed conversion, weight at 30 days and water intake. In the experiment II, the inclusion of 10 and 20% of manioc bagasse with and without enzymatic complex influenced (p <0.05) the feed consumption, the relative weight of the spleen and pancreas and the color parameter (b *), no effect (p> 0.05) on weight gain, final weight, feed conversion, carcass yields and noble cuts, relative weights of gizzard, heart, liver, small intestine, large intestine, bursa and (a *), brightness (L *), pH, shear force (FC), weight loss per cooking (PPCO), chemical analysis, protein deposition and meat fat It is recommended to use up to 20% cassava bagasse, not being technically feasible option the use of the fungal enzyme complex, xylanase and amylase, in the diets for slow growing chickens.