The effects of the ionophore (sodic monensin) and of the probiotic (Saccharomyces cerevisiae + selenium + chrome) were evaluated in rations with 50:50% of forage:concentrate ratio on the total (TDC) and partial [ruminal digestibility coefficients (RDC) and intestinal (IDN)] nutrients digestibility coefficients. Three Murrah buffalos (Bubalus bubalis) and three steers Holstein (Bos taurus), with an of 477 ± 47 kg and 518 ± 56 kg of average weight respectively, and with ruminal and duodenal cannulas were used; the animals were designed into two 3 <FONT FACE=Symbol>´</FONT> 3 latin squares and in a 3 <FONT FACE=Symbol>´</FONT> 2 factorial arrangement. The acid insoluble ash was the internal marker for fecal and duodenal flow. No interaction of diet and animal species for TDC of nutrients was observed, although the ionophore addition in the ration showed a positive effect on TDC for DM, CP, EE and starch and the probiotic addition increased TDC of starch, NDF and ADF. The ionophore and probiotic addition provided higher ruminal fermentation of NDF and ADF and higher IDC of starch. It was observed higher TDC of CP and starch for bovine and higher TDC of NDF for buffaloes. There was interaction of rations <FONT FACE=Symbol>´</FONT> species only on RDC and IDC for DM, CP and EE. The ionophore addition was effective to increase the ruminal fermentation of DM, to reduce ruminal degradation of CP and to increase IDC of CP for both species. The probiotic addition also reduces ruminal degradation of CP in buffaloes, but in lower scale than ionophore. For buffaloes, the presence or absence of additives in rations caused higher RDC of DM, the absence of addictives in ration caused higher RDC and lower IDC of CP than in bovine.
additive; bovideos; sodic monensin; Saccharomyces cerevisiae
