Essential oils (EOs) are effective antimethanogenic agents but some of them have adverse effect on feed digestibility. Therefore, a blend of ajwain (Trachyspermum ammi) oil, garlic (Allium sativum) oil and cinnamon (Cinnamomum zeylanicum) leaf oil (BEO) having anti-methanogenic activities was used at lower concentrations to avoid adverse effect on digestibility of feed in an in vitro gas production test. Inclusion of the BEO at graded levels of 0.66, 1.0, 1.33, 1.66 and 2.0 μl/ml of incubation medium resulted in a linear depression (Pin vitro true dry matter and organic matter digestibility of feed was also inhibited (Pin vitro true degradability (IVTD) of feed.