Research Reveals New Insights into Rumen Fermentation and Methane Production

New research from the University of Copenhagen has shed light on the effects of various chemical compounds on rumen fermentation and methane production in livestock. The study, published in BMC Microbiology, investigated the dose-response effects of several compounds on methane production, fermentation, and prokaryotic community composition. The findings suggest that certain compounds can inhibit methanogenesis without affecting dry matter degradability, and that some methanogens have developed resistance to halogenated compounds like BES.

Key Takeaways:

• The study evaluated the effects of three compounds: sodium 2-bromoethanesulfonate (BES), p-hydrocinnamic acid (HoC), and sodium fumarate dibasic (DFS) on rumen fermentation and methane production.
• BES was found to decrease methane yield and concentration without affecting dry matter degradability, while HoC and DFS shifted hydrogen utilization towards acetate and propionate production.
• The recommended doses for BES, HoC, and DFS to reduce methane production in-vitro rumen fermentation were determined to be 2.5 mmol/L, 5 mmol/L, and 10 mmol/L, respectively.
• The research highlighted the need for further study on the interactive effects of methane inhibition compounds and hydrogen sink compounds.
• Caution is advised when using halogenated compounds like BES, as some methanogens have developed resistance.

Statistics:

• The study used an in-vitro rumen fermentation system to evaluate the effects of the compounds on methane production, fermentation, and prokaryotic community composition.
• The evaluation was conducted over 48 hours, with dry matter degradation (dDM) ranging from 30-40%.
• The compounds studied were added at different concentrations, with BES doses ranging from 0-10 mmol/L, HoC doses ranging from 0-10 mmol/L, and DFS doses ranging from 0-20 mmol/L.
• The major bacterial phyla across all samples were Bacteroidetes, Proteobacteria, Firmicutes, Spirochaetota, Verrucomicrobiota, and Patescibacteria.

Sources:

• Investigating dose-dependent effects of chemical compounds targeting rumen fermentation pathways using an in-vitro rumen fermentation system. BMC Microbiology, 2025;25(1):330. www.biomedcentral.com/bmcmicrobiol/
• NewsRx. University of Copenhagen Reports Findings in Microbiology (Investigating dose-dependent effects of chemical compounds targeting rumen fermentation pathways using an in-vitro rumen fermentation system). Chemicals & Chemistry. June 13, 2025; p 4882.