Livestock emissions refer to the greenhouse gases—primarily methane and nitrous oxide—released through animal digestion, manure management, and associated feed production. These emissions significantly affect plant science because elevated atmospheric methane and nitrous oxide alter soil microbial communities, nutrient cycling, and plant-available nitrogen, directly impacting crop productivity and ecosystem function. Researchers study how pasture and forage plants can be optimized to reduce enteric fermentation while maintaining yield, making plant breeding and agronomy central tools in mitigating agricultural greenhouse gas output.
Scientists screened 3,900 plant compounds and found that proanthocyanidins — tannins abundant in berries, grapes, and apples — can significantly reduce methane emissions from cattle by blocking a key enzyme in methane-producing gut microbes and reshaping the rumen's microbial community.
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Proanthocyanidins ranked as the top candidate among 3,900 phytochemicals screened, with a predicted binding affinity of -8.150 kcal/mol to the methane-producing enzyme MCR.
PAC supplementation also reshaped the rumen microbial community, suggesting a dual mechanism: direct enzyme inhibition plus microbiome-level suppression of methanogens.
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