Degradabilidade in situ do feno de Brachiaria decumbens suplementado com energia e proteína

Abstract

This experiment was conducted in order to evaluate the effect of supplementation with energy and protein on the degradability of DM (dry matter), CP (crude protein) and NDF (neutral detergent fiber) of Brachiaria decumbens hay. 03 Jersey cows were taken and fistulated in the rumen averaging 450 kg. The experiment was divided into four parts of 18 days, being 14 days for adaptation and 04 days for collect. The animals received Brachiaria decumbens hay all experiment long, and 0,1% of body weight supplement. The treatments were: Mineral Supplement (MS) - minerals + urea; Energetic Supplement (ES) - minerals + urea + corn; Protein Supplement (PS) - minerals + urea + soybean meal and energetic-protein Supplement (EPS) - minerals + urea + corn + soybean meal. The hay used presented 91% of DM, 77,3% of NDF and 5,7% of CP being incubated in natura. The ruminal degradability was stimulated by the nylon bag technique. The samples were placed in the bags, in the relation 15mgDM/cm2 , and incubated during 0, 3, 6, 12, 24, 36, 48, 72 and 96 hours. Through the results obtained, it was verified that for the soluble fractions and effective degradability, there was difference (P<0,05) among the treatments for DM, NDF and CP. The insoluble fraction degradation was influenced (P<0,05) by treatments for protein fraction. The supply of protein and/or energetic sources promoted improvement in the ruminal environment resulting in higher degradation of soluble fractions, insoluble degradation and effective degradability.