元素マグネシウム補給によるヤギの第一胃内水素ガス産生と発酵・微生物叢への影響
A randomized block trial with 20 growing goats compared dietary supplementation of elemental Mg (0.6%) versus Mg(OH)2 (1.45%) over a 28-day adaptation period. Elemental Mg elevated dissolved H2 in rumen fluid by 180% at 2.5 hours post-feeding (P<0.001), while ruminal Mg2+ concentrations remained equivalent between groups. Total volatile fatty acid concentrations fell by 8.6% and the acetate-to-propionate ratio declined by 11.8%, whereas the molar proportion of propionate rose by 11.6%. Methanogen copy numbers increased by 47.9%, and both dissolved CH4 and total CH4 emissions were elevated (+35.6% and +11.7%, respectively). Fungal copy numbers decreased markedly by 63.6%, though overall bacterial community composition was largely unchanged. Correlation analyses indicated that elevated ruminal dissolved H2 was associated with reduced acetate proportions and fungal abundance, and with increased propionate proportions and methanogen numbers. These findings suggest that elemental Mg-derived H2 in the rumen shifts fermentation toward propionate production, suppresses fungal populations, and promotes methanogenesis.
Elemental Mg reacts with rumen fluid to generate dissolved H2, which suppresses acetate-pathway fermentation, promotes propionate production, increases methanogen populations, and reduces fungal copy numbers in the rumen.
This study is at the animal-experiment stage. For human application, inhalation is the most promising delivery route, but inhalation carries explosion risk and concentration matters (empirical LFL of 10%; high-concentration devices are documented in the Consumer Affairs Agency accident database and are not recommended).
See also:
https://h2-papers.org/en/papers/28927478