The aim of this experiment was to evaluate the effect of tannin on grain over potential degradability parameters of the dry matter and crude protein of six sorghum silage genotypes by in situ technique. It was used four crossbred steers, canulated in rumen, fed ad libitum twice at day with a diet comprised by Cynodon dactylon hay. Six sorghum silage genotypes, harvested at milk stage, were incubated in the rumen: BR 303, BR 304, BR 601, and AG 2006 (without tannin on grain); BR 700, and BR 701 (with tannin on grain). Five grams of samples were incubated at times: 6, 12, 24, 48, 72, and 96 hours. The time zero (t0) was used to calculate the soluble fraction. Tannin decrease the extent of degradation of dry matter and crude protein of BR 700 and BR 701 sorghum silages. The potential degradabilities of these nutrients were reduced by tannin presence on grain. There was not effect of tannin on degradation rate of the nutrient compounds in anyone tested sorghum silage.
cattle; degradability; rumen; sorghum silage; tannin
