Effects of essential oils from medicinal plants acclimated to Benin on in vitro ruminal fermentation of Andropogon gayanus grass.

Kouazounde, J.B., Jin, L., Assogba, F.M., Ayedoun, M.A., Wang, Y., Beauchemin, K.A., McAllister, T.A., and Gbenou, J.D. (2015). "Effects of essential oils from medicinal plants acclimated to Benin on in vitro ruminal fermentation of Andropogon gayanus grass.", Journal of the Science of Food and Agriculture, 95(5), pp. 1031-1038. doi : 10.1002/jsfa.6785  Access to full text

Abstract

BACKGROUND: Plants from West Africa commonly used in both human and veterinary medicine contain various secondary metabolites. However, their potential in mitigating ruminal methane production has not been explored. This study examined the effects of seven essential oils (EOs) from plants acclimated to Benin at four dosages (100, 200, 300 and 400 mg L1), on in vitro rumen microbial fermentation and methane production using Andropogon gayanus grass as a substrate. RESULTS: Compared to control, Laurus nobilis (300–400 mg L1), Citrus aurantifolia (300–400 mg L1) and Ocimum gratissimum (200–400 mg L1) decreased (P < 0.05) methane production (mL g1 DM) by 8.1–11.8%, 11.9–17.8% and 7.9–30.6%, respectively. Relative to the control, reductions in methane (mL g1 DM) of 11.4%, 13.5% and 14.2% were only observed at 400 mg L1 for Eucalyptus citriodora, Ocimum basilicum and Cymbopogon citratus, respectively. These EOs lowered methane without reducing concentrations of total volatile fatty acids or causing a shift from acetate to propionate production. All EOs (except M. piperita) reduced (P < 0.05) apparent dry matter (DM) disappearance of A. gayanus. CONCLUSIONS: The current study demonstrated that EOs from plants grown in Benin inhibited in vitro methane production mainly through a reduction in apparent DM digestibility.

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