Three Holstein steers, canulated in the rumen, where were incubated nylon bags with sugarcane bagasse, were maintained in feedlot, in individual boxes, according to the following treatments: T1 - bagasse without treatment (control); T2 - bagasse treated with 2.5% Na2S; T3 - bagasse treated with 4% NH3 and T4 - bagasse treated with 2.5% Na2S + 4% NH3. Higher potential degradability was observed for the treatment with bagasse treated with NH3 and NH3 plus Na2S. Dry matter degradability ranged from 38.3 to 65.5%, in the control for the treatment with bagasse treated with anhydrous ammonia after 96-h incubation. It were observed higher values of potentially degradable "b" fraction for the neutral detergent fiber and smaller values of indigestible "I" fraction for the treatment with bagasse treated with NH3, independently of sulfate. Effect similar to the NDF degradability was observed for the ADF degradability, where higher values of potentially degradable "b" fraction smaller values of indigestible "I" fraction were also observed for the treatment with bagasse treated with NH3, independently of sulfate. Higher values of effective degradability were observed for the treatment with bagasse treated with NH3 and Na2S plus NH3, when compared to control and Na2S, that showed similar and smaller results.
ammoniation; anhydrous; bagasse; residue
