Ruminal degradability of dry matter and crude protein of different by by-products fed to steers

Abstract

The ruminal degradability of different byproducts was evaluated by the in situ technique. The feeds were incubated in the rumen of three crossbred E x Z steers averaging 300 kg for 72, 48, 24, 18, 12, 6, 3 e 0 hours. The potentially degradable fraction and effective degradability of DM and CP for the sunflower crushed were, respectively, 40.2 and 26.2% and 50.97 and 38.65%. The crushed soybean presented soluble fraction of 36.6 and 20.7%, for DM and CP, with an effective degradability of 72.5 and 69.9%, and the crushed grape, of 21.61 and 19.84% for DM and CP, with degradation rate of 4.2 and 7.67%/h, that resulted in effective degradabilities of 54.36 and 50.03 for DM and CP, respectively. For the protein, the cookie residue showed high soluble fraction (53.87%), the soybean hulls, high potentially degradable fraction (77.55%), and the wheat hulls, soluble fraction (63.23%).