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Journal of the Science of Food and Agriculture
14, DOI: 10.1002/jsfa.6785

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

Jacques B Kouazounde, Long Jin, Fidele M Assogba, Marc A Ayedoun, Yuxi Wang, Karen A Beauchemin, Tim A McAllister and Joachim D Gbenou

Agriculture and Agri-Food Canada, Lethbridge Research Centre P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1.


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 400mgL-1), on in vitro rumen microbial fermentation and methane production using Andropogon gayanus grass as a substrate.

RESULTS Compared to control, Laurus nobilis (300400mgL−1), Citrus aurantifolia (300400mgL−1) and Ocimum gratissimum (200400mgL−1) decreased (P < 0.05) methane production (mL g−1 DM) by 8.111.8%, 11.917.8% and 7.930.6%, respectively. Relative to the control, reductions in methane (mL g−1 DM) of 11.4%, 13.5% and 14.2% were only observed at 400mgL−1 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.

Keywords: essential oil; in vitro; rumen; volatile fatty acids; digestibility; methane.

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