Levedura (Saccharomyces cerevisiae) e enzima fibrolítica na dieta de cordeiros terminados em confinamento

Abstract

The objective was to evaluate the effect of including the yeast Saccharomyces cerevisiae associated with exogenous fibrolytic enzyme in the diet of feedlot lambs based on intake, performance, carcass traits and blood metabolites. Forty male lambs were used, with an average initial weight of 25.275± 2.74kg, not castrated, distributed in a completely randomized design, with five treatments and eight replications. Treatments consisted of the inclusion of additives alone or in combination in the diet, divided into: control (no additives); 100% yeast (yeast inclusion only); yeast 70% (inclusion of 70% yeast and 30% fibrolytic enzyme); 100% enzyme (inclusion of enzyme only) and 70% enzyme (inclusion of 70% fibrolytic enzyme and 30% yeast). The inclusion of yeast and fibrolytic enzyme in the diet of lambs did not promote changes (P>0.05) in nutrient intake, animal performance, carcass traits, or clinical condition of the animal. There was an effect of the inclusion of additives on albumin (P= 0.02) and cholesterol (P= 0.00) concentrations, however, it did not affect the other blood metabolites evaluated. The additives evaluated in this study did not improve the performance of feedlot lambs at the tested doses.