Avaliação dos níveis de energia na dieta de cordeiros terminados em confinamento

Abstract

The aim of this study was to evaluate the performance, feeding behavior, and carcass yields of Santa Inês lambs (SI) and ½ Dorper x Santa Inês (SI x D) feedlot and fed diets containing three levels of power (2.50, 2.79 and 3.03 Mcal / kg DM). We used 30 lambs, 15 of each genotype, with an average age of 120 days, in a completely randomized design in a 2 x 3 factorial design with 5 replications. Diets were isonitrogenous, containing 14% crude protein. The energy density of the diet affect the intake of dry matter and nutrients (P <0.05). Increased energy levels of diets improved weight gain, feed conversion and carcass hot and cold the animals studied as increased energy levels up. There was a positive effect (P <0.05) of the energy levels of the diets for the times when eating, ruminating and idling (h / day), intake and efficiency of rumination (kg DM / h). There was no effect (P <0.05) the energy level of the diets on intake and efficiency of rumination (NDF kg / h). With the increase of the energy levels of the diets had a positive influence on performance, feeding behavior, and carcass yield of feedlot lambs.