Molecular hydrogen produced by elemental magnesium inhibits rumen fermentation and enhances methanogenesis in dairy cows
Open accessAbstract
Hydrogen is a key metabolite that connects microbial fermentation and methanogenesis in the rumen. This study was to investigate the effects of elevated H 2 produced by elemental Mg on rumen fermentation and methanogenesis in dairy cows. Four nonlactating Chinese Holstein dairy cows were employed for this experiment in a replicated crossover design. The 2 dietary treatments included a basal diet supplemented with Mg(OH) 2 (14.5 g/kg of feed dry matter) or elemental Mg (6.00 g/kg of feed dry matter). When compared with Mg(OH) 2 treatment, cows fed diet with elemental Mg had similar rumen Mg 2+ concentration, but higher rumen dissolved H 2 and methane concentrations at 2.5 h after morning feeding. Also, elemental Mg supplementation decreased feed digestibility, rumen volatile fatty acid concentration, and relative abundance of group Ruminococcaceae_UCG-014, genus Bifidobacterium, and group Mollicutes_RF9, increased acetate to propionate ratio, succinate concentration, and abundance of family Christensenellaceae. Elemental Mg supplementation increased enteric CH 4 emission, altered methanogen community with increased abundance of order Methanomassiliicoccales, 16S ribosomal RNA gene copies of methanogens, and order Methanobacteriales. In summary, the pulse of elevated dissolved H 2 after feeding produced by elemental Mg inhibited rumen fermentation and feed digestibility by decreasing the abundance of carbohydrate-degrading bacteria, promoted H 2 incorporation into succinate by…
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These findings suggest that the cecum favors reductive acetogenesis over hydrogenotrophic respiration, consistent with the higher concentration of dH2 in the cecum, which can enhance the competitiveness of reductive acetogenesis.
“Altogether, these findings suggest that the cecum favors reductive acetogenesis over hydrogenotrophic respiration, consistent with the higher concentration of dH2 in the cecum (Fig. 1D), which can enhance the competitiveness of reductive acetogenesis [42, 43].”
From Reductive acetogenesis is a dominant process in the ruminant hindgut (2025) · cites this paper as [43]
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- Authors
- Ma, Z. Y., Zhang, X. M., Wang, M., Wang, R., Jiang, Z. Y., Tan, Z. L., Gao, F. X., & Muhammed, A.
- Affiliations
- Chinese Academy of Sciences (CN)
- Hunan Agricultural University (CN)
- Corresponding author
- Wang, Min
- Venue
- Journal of Dairy Science
- Publisher
- American Dairy Science Association
- Published
- 2019-06
- Volume
- 102
- Issue
- 6
- Pages
- 5566-5576
- ISSN
- 0022-0302 (ISSN-L)
- OpenAlex
- W2936341216
- Cited by
- 22
- References
- 58
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 7 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 2
- FWCI
- 2.46
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Dairy Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
- Keywords
- molecular hydrogen, magnesium supplementation, rumen fermentation, methanogenesis, dairy cattle, enteric methane, volatile fatty acids, feed digestibility, rumen microbiota, Methanomassiliicoccales, Methanobacteriales, Christensenellaceae, Bifidobacterium, succinic acid, acetate to propionate ratio, magnesium hydroxide
- MeSH terms
- Animals, Animal Feed, Cattle, Diet, Fatty Acids, Volatile, Female, Fermentation, Hydrogen, Lactation, Magnesium, Methane, Propionates, Rumen, Dietary Supplements
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