DefinePK

Abstract

The present study was carried out to determine the in situ degradation kinetics of total mixed rations supplemented with or without exogenous fibrolytic enzymes (EFE) using Nylon bag technique in bulls. Four dietary treatments viz., TMR with R: C ratio of 60: 40 (T1), T1 supplemented with exogenous fibrolytic enzymes (T2), TMR with R: C ratio of 70: 30 (T3) and T3 supplemented with exogenous fibrolytic enzymes (T4) were evaluated for their rumen degradable DM, CP, NDF and ADF using three buffalo bulls fitted with a permanent rumen fistula. In sacco study revealed that the effective degradability (ED) of DM, CP, NDF and ADF were higher (P<0.01) in TMR with R: C ratio of 60: 40 (T1) when compared to that with 70: 30 (T3). Further, the % effective degradability of DM, CP, NDF and ADF increased (P<0.01) with the supplementation of EFE in TMRs irrespective of R: C ratio. It is therefore concluded that supplementation of EFE in TMRs has a positive effect irrespective of the R: C ratio as evidenced by their increased degradation rates in the rumen.