Influence of inclusion of low doses of tannin blends in beef cattle dietary supplements on in vitro and in situ digestibility of nutrients in some feedstuffs

The objective of this study was to evaluate the effects daily supplementation with a low dosage blend condensed and hydrolysable tannins on in vitro situ digestibility protein fibrous feedstuffs. In ruminal incubation assays were conducted seven five roughage feedstuffs without tannin (1 g/kg DM intake). From these same cattle, rumen fluid collected for incubations we evaluated gas production (GP) up 24 h and, sequentially, dry matter (IVDMD), crude (IVCPD), fiber (IVNDFD), ammonia nitrogen (NH3-N). For assays, disappearance curves modeled then potentially degradable (), digestion rate undegradable () fractions estimated. Of all variables studied, only IVCPD soybean meal showed effect (P<0.05) addition dose tannins. affected CP cottonseed meal. increased Marandu (dry season), Additionally, corn silage reduced. by increase Daily grazing cattle affects some feedstuffs, which are