In ruminants, nutrients input are the first to fermentative digestion by ruminal microorganisms. Methane (CH4) production through enteric fermentation is of concern worldwide for its contribution to the accumulation of greenhouse gases in the atmosphere, as well as its being a waste of fed energy (Boadi et al., 2004). There is an interest in decreasing CH4 emission by inhibition of ruminal methanogens thus increasing the efficiency of feed energy utilization for ruminants and would have significant