Effect of Urea and Exogenous Fibrolytic Enzyme Treated Paddy Straw on In Vitro Rumen Fermentation Characteristics and Degradability

This study was conducted to evaluate the effect of urea and exogenous fibrolytic enzyme (EFE) treatmenton in-vitro digestibility and fermentation attributes of paddy straw. In this study, in vitro degradabilityof nutrients in paddy straw as an effect of treatment of urea and EFE at various levels (1.0, 2.0, 3.0, 3.5, 4.0,4.5, 5.0, 6.0, 7.0, 8.0 and 9.0 % of urea and 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0 and 9.0 g/kg DM of EFE) weretested. For selecting the best levels of urea and EFE, test samples were incubated with strained rumenliquor and different dosages levels were studied on rumen fermentation parameters like total gas productionalong with in vitro DM and OM digestibility, ammonia nitrogen, pH and some calculated parameterssuch as partitioning factor (PF), microbial biomass production (MBP) and efficiency of microbial proteinsynthesis (EMPS) by incorporation of urea and EFE treated paddy straw. The result showed significantimprovement on in vitro dry matter digestibility (IVDMD), in vitro organic matter digestibility (IVOMD),in vitro total gas production (IVTGP), MBP and PF at 4% and 8 g/kg DM of urea and EFE treatment levelin comparison to other levels. The optimum results were obtained at 4% and 8 g/kg DM of urea and EFEtreated paddy straw, hence a 4% and 8 g/kg DM dosage, respectively may be selected for in vivo study