Metionina protegida na dieta de bovinos de corte confinados

Abstract

The use of ruminally protected amino acids (AA) in ruminant diets. They increase the blood concentration of the amino acid, regardless of the commercial product used. However, the results on the productive performance of production animals are controversial, which prevents its practical use in commercial meat production systems. Thus, the objective of this master's thesis is to test the use of ruminal methionine (met-RP) in the diet of feedlot beef cattle. In the first chapter, a literature review on the subject will be presented: use of met-RP in the diet of beef cattle and dairy cows, and later a field experiment will be carried out. The experiment was carried out in commercial confinement, using met-RP or not in the finishing diet of beef cattle, housed in collective pens. According to the literature review carried out on the basis of scientific data, using research parameters, Target population studied, Intervention with met-RP combined or not with other variation factors, Comparison with negative controls, and Results obtained with dispersion measures. The use of met-RP combined with other variation factors, such as protein level and steroid hormone use, showed improvement in performance. However, when compared with the negative control: diets without met-RP, with corn and soybean meal in their formulation showed better performance. The field experiment will be presented in chapter II, in this study the animals were based on a diet, with distillery grain and corn as protein and energy foods in the diet. The inclusion of met-RP in the diet did not improve the performance of the animals. This corroborates the fact that diets with corn in their composition do not have a more limiting (AA) to Met.