. 2015. Effects of essential oils from African basil on fermentation of Andropogon gayanus grass in the Artificial Rumen (RUSITEC). Can. J. Anim. Sci. 95: 425Á431. Essential oils (EO) from African basil (Ocimum gratissimum) have shown the potential to modify rumen microbial fermentation and reduce ruminal methane production from grass forages in in vitro batch cultures. However, it is not known whether the effects of EO on rumen microbial fermentation attenuate over time. The objective of this study was to examine the effects of African basil EO at 0 (control), 100, 200 and 400 mg L(1 incubation medium on microbial fermentation and methane production in the Rumen Simulation Technique (RUSITEC) using Andropogon gayanus grass as a substrate. African basil EO quadratically affected (PB0.05) methane production gas production and the pH of fermenter liquid. Total volatile fatty acid (VFA) production was linearly decreased (PB0.05) by African basil EO along with a shift in VFA profile towards less propionate and more acetate and butyrate. African basil EO quadratically altered (PB0.05) apparent dry matter, neutral detergent fiber digestibility, 15 N incorporation into total microbial protein and the total production of microbial protein. This study confirms that EO from African basil quadratically affected methane emissions arising from the ruminal fermentation of A. gayanus grass mainly by reducing overall digestibility of the forage. Les effets des huiles essentielles du basilic africain sur la fermentation de l'herbe Andropogon gayanus dans le rumen artificiel (RUSITEC). Can. J. Anim. Sci. 95: 425Á431. Les huiles essentielles (EO Á « essential oils ») provenant du basilic africain (Ocimum gratissimum) montrent un potentiel pour modifier la fermentation microbienne dans le rumen et re´duire la production de me´thane ruminal a`partir de fourrages d'herbes dans les cultures en batch in vitro. Cependant, il n'est pas connu si les effets des EO sur la fermentation microbienne dans le rumen s'atte´nuent avec le temps. Les objectifs de cette e´tude e´taient d'examiner les effets des EO du basilic africain a`0 (te´moin), 100, 200 et 400 mg L(1 de milieu d'incubation sur la fermentation microbienne et la production de me´thane dans le simulateur technique du rumen (RUSITEC) en utilisant l'herbe Andropogon gayanus comme substrat. Les EO du basilic africain ont eu un effet quadratique (PB0,05) sur la production de me´thane, la production de gaz et le pH du liquide a`fermentation. La production d'acides gras volatils (VFA Á « volatile fatty acids ») totaux diminuait de fac¸on line´aire (PB0,05) par les EO du basilic africain et il y avait une transition dans le profil des VFA vers moins de propionate et plus d'ace´tate et de butyrate. Les EO du basilic africain modifiaient de fac¸on quadratique (PB0,05) les matie`res se`ches (DM Á « dry matter ») apparentes, la digestibilite´des fibres de de´tergent neutre (NDF Á « neutral detergent fibre »), l'incorporation du 15 N dans les prote´ines microbiennes totales et la production tot...
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