ArticleMicrobiome2026
Yeast culture promotes butyrate produced fibrolytic bacteria as intracellular hydrogen sink in the rumen.
Article in Microbiome, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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1 citing paper in PubMed.
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9 authors.
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Abstract
backgroundYeast culture (YC) supplementation is widely adopted to mitigate rumen pH depression and alleviate the inhibition of fiber degradation under starch-rich diets. Yet, the underlying microbial mechanisms, particularly how yeast culture orchestrates fibrolytic communities and affects metabolic hydrogen flow in the rumen, remain a critical knowledge gap. Accordingly, elucidating the microbial basis by which yeast culture modulates fiber degradation and hydrogen utilization under starch-rich diets is of both theoretical and practical importance.
methodsWe conducted a study with growing lambs receiving starch-rich diets that differed only in yeast culture supplementation (CON 0%, YC 1%). We evaluated their growth performance, apparent total-tract digestibilities, rumen fermentation end-products, and the rumen metagenome.
resultsThe YC treatment increased the lambs' final body mass (P = 0.02), average daily gain (P = 0.03), digestibilities of neutral detergent fiber (P < 0.001) and acid detergent fiber (P < 0.001), and rumen pH (P < 0.05), and tended to increase organic matter digestibility (P = 0.09). In addition, total VFA concentrations, particularly butyrate, were higher at 6 h post-morning feeding (P = 0.01). Fibrolytic and hydrogenotrophic taxa (e.g., Ruminococcus_E and Quinella) and CAZyme families, including GH43, GH31, GH9, and GH35, were enriched by the YC treatment, as were bacteria involved in fiber degradation and butyrate production. Furthermore, none of the top five YC treatment-enriched bacterial genomes contained any hydrogenase genes, which indicates that this butyrogenic fibrolytic consortium is significantly different from the hydrogen-producing fiber-degrading microorganisms we are familiar with.
conclusionYeast culture supplementation promoted the proliferation of a distinct butyrogenic consortium that degrades fiber while apparently disposing intracellularly metabolic hydrogen generated during fermentation, rather than releasing it as H
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