This study was conducted to determine the in vitro gas production (GP), organic matter digestibility (OMD), and energy values of ensiled white mulberry pomace (WMP), meadow grass (MG), and the mixtures of the two crops at three different ratios. The silages in WMP/MG mixtures containing 100, 75, 50, 25, and 0% WMP were evaluated by using of ANKOM RF GP system. It was observed that increasing levels of WMP in the silages enhanced GP. Whereas the OMD value of WMP silage was highest (53.27%) among all silages, MG silage was the lowest (47.83%). Higher ME, NEL, and OMD values were obtained in WMP and MG mixture silage at a ratio of 75:25 compared with the other mixtures. The results indicated that the OMD, ME, NEL, and non-fiber carbohydrate values were positively correlated with r=0.966, r=0.981, and r=0.957, respectively). The results of the study showed that the OMD and energy values of WMP100/MG silage were higher than the other silages. In addition, since ensiling of WMP with MG at different ratios will be resulted in increases in OMD and energy values of WMP/MG silages, incorporating unusual silages like WMP/MG silage into diets may provide a benefit to reduce in cost of livestock production.