Methane emissions in ruminants account for a 2% to12% of gross energy loss of feeds depending upon the type of diets. Therefore, inhibition of methane production in the rumen has been attempted for more than three decades to increase the utilization of feed energy for production purposes. Dietary/nutritional interventions look promising in suppressing methane emissions in ruminants, however, results are not consistent in different studies because of great variations in chemical composition of inhibitory compounds used, doses, and feed composition.

Keywords: Emmission; Interventions; Composition; Greenhouse; Ruminant; Gross energy.