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L’efficacite du metabolisme azote et energetique pour repondre aux besoins des ruminants a haut niveau de production depend de la digestion microbienne du rumen. Celle-ci pourrait etre amelioree par l’utilisation des huiles essentielles (HE). L’objectif de ce travail est donc de contribuer a l’amelioration des connaissances sur la valorisation des huiles essentielles (HE) dans l’alimentation des ruminants. Cet essai portant sur l’effet de l’huile essentielle (HE) des rhizomes de Zingiber officinale sur les parametres de digestibilite in vitro du foin de Pennisetum clandestinum a ete mene au Laboratoire de Production et Nutrition Animales (LAPRONAN), de l’Universite de Dschang. L’huile essentielle a ete extraite des rhizomes de Zingiber officinale par La technique d’hydrodistillation. La ration etait constituee de Pennisetum clandestinum (70%) et Bidens pilosa (30%). Trois doses (0, 40 et 80 μl) de l’huile essentielle ont ete utilisees lors de l’incubation des differentes rations. Les resultats de cette etude ont montre que l’ajout de 40 ou 80 μl d’huiles essentielles n’a eu aucun effet significatif sur le volume de gaz produit (GP) apres 24 h d’incubation, l’energie metabolisable (EM), la production d’acide gras volatils (AGV) et la digestibilite de la matiere organique (DIVMO). Par contre, la digestibilite de la matiere seche (DIVMS), la masse microbienne (MM) et l’azote residuel (NDF-N) ont significativement (p˂0,05) baisse avec le niveau croissant d’incorporation d’huile essentielle. La quantite de matiere organique fermentee pour produire 1ml de gaz (FC) des rations contenant 40 (4,4 mg/ml) ou 80 μl (4,41 mg/ml) d’huiles essentielles a ete comparable (P˃0,05) mais significativement (P˂0,05) plus eleves que celle de la ration sans huile essentielle (2,44 mg/ml). De maniere generale, l’incorporation de l’huile essentielle de Zingiber officinale dans la ration n’a pas ameliore les parametres de digestibilite chez les moutons. © 2018 International Formulae Group. All rights reserved. Mots cles: Digestibilite in vitro , huile essentielle, Pennisetum clandestinum , Zingiber officinale English Title:  Effects of essential oil rhizomes of Zingiber officinale on the in vitro digestibility of the hay of Pennisetum clandestinum English Abstract The efficiency of metabolic nitrogen and energy for better ruminant’s production depends ruminal microbial digestion which could be improved by the use of the essential oil. This study aimed at improving the knowledge on the valorization of the essential oil within the ruminant’s feeding. Thus, the study of the effects of essential oil (EO) of Zingiber officinale on the in vitro digestibility parameters of the Pennisetum clandestinum hay was conducted in the Laboratory of the Livestock Productions, Animal Nutrition and feeding of the University of Dschang. Essential oil was extracted from the rhizomes of Zingiber officinale by hydrodistillation technique. The ration consisted of Pennisetum clandestinum (70%) and Bidens pilosa (30%) associated with three doses (0, 40 and 80 μl) of essential oil of Zingiber officinale with sheep ruminal fluid. The results showed that the addition of 40 or 80 μl of essential oils did not have any significant effect on production of gases (PG) after 24 h of incubation, metabolized energy, the volatile fatty acid production and the in vitro digestibility of the organic matter. On the other hand, the in vitro digestibility of the dry matter, microbial mass and residual nitrogen decreased significantly (p˂0.05) with the increasing level of essential oil. The organic matter fermented for the production of 1 ml gas (partitioning factor) of rations containing 40 (4.4 mg/ml) or 80 μl (4.41 mg/ml) essential oils was comparable (P˃0.05) but, significantly (P˂0.05) higher than that of the ration without essential oil (2.44 mg/ml). Generally, the incorporation of essential oils in the ration did not improved digestibility parameters at the sheep. © 2018 International Formulae Group. All rights reserved. Keywords:  In vitro digestibility, essential oil, Pennisetum clandestinum , Zingiber officinale

international journal of biological and chemical sciences

Effets de l’huile essentielle des rhizomes de &lt;i&gt;Zingiber officinale&lt;/i&gt; sur la digestibilité &lt;i&gt;in vitro&lt;/i&gt; du foin de &lt;i&gt;Pennisetum clandestinum&lt;/i&gt;