Produção total de gases e degradabilidade in vitro de dietas com torta de girassol

The objective was to determine the effect of increasing levels of sunflower crushed in ruminant diets about the in vitro digestibility of dry matter (DIVMS), organic matter (DIVMO), crude protein (DIVPB), the cinetics cumulative production gases, parameters ruminal fermentation, concentrations of total ammonia nitrogen (N-NH3) and pH in vitro. Used Tifton hay and the concentrates were characterized by the presence of 0 g/kg 100 g/kg 200 g/kg and 300 g/kg of sunflower crushed inclusion in concentrated. There significant influence (p 0.05) by experimental diets, however, there was a decreasing linear effect (p<0.05) for degradation of fraction D and their respective rate of degradation (fraction E). The pH of the rumen fluid had a linear decrease (p<0.05) as a function of incubation time, since the ammonia nitrogen concentration (N-NH3) presented positive linear increase (p<0.05) with increasing level of sunflower crushed in the diet. The use of diets with sunflower crushed changed DIVMS and DIVMO, however, did not intervene in DIVPB altered production of gas and the parameters (pH and ammonia-N), demonstrating its potential use by up to 200 g/kg of inclusion.