Níveis de complexo enzimático na dieta alimentar de novilhos confinados

Abstract

This essay aimed to evaluate animal performance, diet apparent digestibility and feeding behavior of feedlot steers, supplemented with different doses of an enzyme complex (Potenzia®). The product was composed by enzymes acting in non-starch polysaccharides (NSPs) based in xylanase, celullase, β-glucanase, mannanase, α-galactocidase and amylase in doses of 0; 2.5; 5.0 and 7.5 grams per animal day-1. The diet used was composed of corn silage in a constant ratio of 50% corn silage and 50% concentrate, on dry basis. 32 steers were used, with initial average weight of 321 kg and an average age of 10 months. The experimental design was of randomized blocks, with four treatments and four repetitions, each repetition representing a stall with two animals. After the execution of the tests for normality and homogeneity, the results were submitted to analysis of variance and compared, using regression procedures to the level of 5% significance. The inclusion of 5.0 grams per animal day-1 of the enzyme complex (Potenzia®) to the diet promoted improvements in the diet apparent digestibility and better disposition of fat in the carcasses. Animal performance and feeding behavior of feedlot steers were not altered by the different doses of enzyme in the diet.