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Since excessive use of in-feed antibiotics and chemical feed supplements can potentially affect health risks and environmental problems, organic feed supplement became alternative save material. Organic material such as essential oils (EO) is potential for feed additive in the livestock industry because of their main activity as rumen manipulator. Their potential as rumen manipulators has not enough for type and doses of essential oils experiment. Therefore, the objective of this study was to evaluate 6 essential oils/EO’s (garlic/, thyme, clove, orange peel, mint, and cinnamon) with different doses (100, 200 and 300 ppm) on in vitro rumen methane reduction and in vitro digestibility using in vitro gas production technique. The experiment resulted highest level in in-vitro methane reduction potential (MRP, %) 72.83% at orange peel oils 300 ppm after 6 h incubation, while using clove oils 300 ppm had highest in vitro true digestibility of dry matter (IVTDDM) 81.41% after 30-hour incubation. Using Cinnamon oils had high value both of MRP level and IVTDDM (48.91 and 79.12 %). In Conclusion, all essential oils reduced in vitro rumen methane production at 6 h incubation compared to control at 300 ppm and there was no negative effect on In Vitro Digestibility.

Potential effect of some essential oils on rumen methane reduction and digestibility by In Vitro incubation technique