The last product of igniting the feed in the rumen is Volatile Fatty Acid (VFA) with a side product in the form of Methane Gas (CH4). Volatile fatty acids (VFA) are a source of energy needed by ruminants, and methane is a wasted energy potential. The purpose of this study was to determine the effect of addition of ruminofrass NPN on partial VFA concentrations and calculation of methane gas from…