Addition of enzymatic complex and deactivated full-fat soybean particle size optimize performance of broilers/Adicao de complexo enzimatico e da granulometria da soja integral desativada melhora desempenho de frangos de corte

This experiment was carried out to evaluate the effect of the enzymatic complex addition and deactivated full-fat soybean particle size on performance of broilers in the period from 1 to 42 days of age. Four hundred and eighty male broiler chicks from the Ross strain were used, allotted to a completely randomized factorial scheme 2x2 (enzyme x particle size). The experimental diets were based on corn, soybean meal and ([+ or -] 1.5 mm or [+ or -] 4.0mm) deactivated full-fat soybean, with or without enzyme. The enzymatic complex (xylanase, [beta]-glucanase, mannase, pectinase and protease) was supplied in the dose of 50g [t.sup.-1] ration. The enzymatic complex addition increased (P=0.0531) the diet intake in 4% and the weight gain in 2.8% in the final period. The feed intake increased 3% in the final period and 2% in the total period in poultry that were fed with fine particle size diet. In the initial period, the chicks that ingested the coarse particle size diet had a 5% weight gain increase and had the greater feed rates. The addition of the enzymatic complex in diets with deactivated full-fat soybean improves the performance of chickens. The use of the soy with fine particle size (1,5mm) in the initial phases for chickens is not recommended. Key words: chickens, exogenous enzyme, full-fat soybean, particle sizes, performance. O experimento foi conduzido com objetivo de avaliar o efeito da adicao de complexo enzimatico e da granulometria da soja integral desativada sobre o desempenho de frangos no periodo de um a 42 dias de idade. Foram utilizados 480 pintos machos da linhagem Ross, distribuidos em um delineamento inteiramente casualizado, em esquema fatorial 2x2 (enzima x granulometria). As racoes experimentais foram formuladas a base de milho, farelo de soja e soja integral desativada ([+ or -] 1,5mm), soja integral desativada ([+ or -] 1,5mm) + enzima, soja integral desativada ([+ or -] 4,0mm) e soja integral desativada ([+ or -] 4,0mm) + enzima. O complexo enzimatico (xilanase, [beta]-glucanase, mannase, pectinase e protease) foi adicionado na dosagem de 50g [t.sup.-1] de racao. A adicao do complexo enzimatico aumentou (P=0,053) em 4% o consumo de racao e 2,8% o ganho de peso no periodo final de criacao. O consumo de racao foi aumentado em 3% no periodo final e (P=0,048) 2% no periodo total em aves que ingeriram racao com granulometria 1,5mm. No periodo inicial, as aves que ingeriram racao com granulometria 4,0mm tiveram aumento de 5% no ganho de pe