Effects of elemental magnesium and Magnesium oxide (cas 1309-48-4) on hydrogen, methane and volatile fatty acids production in in vitro rumen batch cultures

Add time:08/18/2019    Source:sciencedirect.com

This study aimed to examine the hypothesis that extra molecular hydrogen (H2) produced by elemental magnesium (Mg) could alter rumen fermentation and methanogenesis in in vitro batch incubation. As elevated Mg2+ may exert negative effects on rumen fermentation, Magnesium oxide (cas 1309-48-4) (MgO) was also included for comparison. Mulberry leaf and corn grain had contrast chemical composition and thus were selected as substrates for incubation. Both elemental Mg and MgO were supplemented at two levels, i.e. 0.625 and 1.25 mmol/bottle. The in vitro incubation was performed for 48 h to measure gas production (GP), H2 gas (gH2) and methane gas (gCH4) production, dissolved H2 and CH4 concentrations, and volatile fatty acids (VFA) production. Elemental Mg or MgO supplementation increased (Plinear < 0.001) Mg2+ concentration and pH in comparison to the control without supplements. There was no statistical difference (P> 0.05) in ruminal Mg2+ concentration between MgO and elemental Mg supplementation. Elemental Mg increased (P < 0.001) gH2 and gCH4 production, dissolved H2 and CH4 concentrations, in comparison to the control and MgO supplementation. Elemental Mg and MgO supplementation had lower (Plinear < 0.001) initial fractional rate of degradation, fractional rate of gas production, GP and VFA concentration than the control. Elemental Mg supplementation decreased (P < 0.05) GP and acetate molar percentage and increased (P < 0.001) propionate molar percentage, in comparison to the control and MgO supplementation. In summary, high Mg2+ concentration (> 5.5 mM) inhibits ruminal fermentation. Extra H2 produced by elemental Mg supplementation has a biological function to inhibit rumen fermentation, enhances ruminal methanogenesis and shifts the fermentation pathway from acetate to propionate production.

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