In Vitro Evaluation of Rice Bran Lyso-phospholipids for Its Use in Ruminant Ration

An in-vitro experiment was carried out to evaluate the level of incorporation of rice bran lysophospholipids (RBLPL) on rumen microbial fermentation. Different levels of RBLPL i.e. 0, 2, 4, 6, 8 and 10% were added to the substrate consisting of roughage and concentrate mixture (60:40). The parameters studied were total gas production, methane production, true dry matter digestibility (TD), in vitro true organic matter digestibility (IVTOMD), partition factor (PF), microbial biomass, NH₃-N, individual volatile fatty acids (VFA) and acetate: propionate ratio. As the level of RBLPL increased in the substrate from 0 to 6%, total gas production, TD and IVTOMD increased linearly and thereafter, there was decrease in these parameters. Methane production decreased with increasing level of RBLPL and lowest methane production was observed at 10% level. There was no significant effect of different levels of RBLPL on NH₃-N, individual VFA, acetate: propionate ratio, PF and microbial biomass production. It was inferred that fiber digestion and microbial population were not affected and the digestibility of DM was maximum at 6% level of RBLPL.