Enhancing Butyrate Production, Ruminal Fermentation and Microbial Population through Supplementation with .

Butyrate is known to play a significant role in energy metabolism and regulating genomic activities that influence rumen nutrition utilization and function. Thus, this study investigated the effects of an isolated butyrate-producing bacteria, , in rumen butyrate production, fermentation parameters and microbial population in Holstein-Friesian cow. An isolated butyrate-producing bacterium from the ruminal fluid of a Holstein-Friesian cow was identified and characterized as RNAL841125 using 16S rRNA gene sequencing and phylogenetic analyses. The bacterium was evaluated on its effects as supplement on in vitro rumen fermentation and microbial population. Supplementation with 10 CFU/ml increased ( < 0.05) microbial crude protein, butyrate and total volatile fatty acids concentration but had no significant effect on NH3-N at 24 h incubation. Butyrate and total VFA concentrations were higher ( < 0.05) in supplementation with 10 CFU/ml compared with control, with no differences observed for total gas production, NH-N and propionate concentration. However, as the inclusion rate (CFU/ml) of was increased, reduction of rumen fermentation values was observed. Furthermore, butyrate-producing bacteria and population in the rumen increased in response with supplementation of , while no differences in the population in total bacteria, protozoa and fungi were observed among treatments. Overall, our study suggests that supplementation with 10 CFU/ml has the potential to improve ruminal fermentation through increased concentrations of butyrate and total volatile fatty acid, and enhanced population of butyrate-producing bacteria and cellulolytic bacteria .