Abstract: By using quadrat investigation and microhistological analysis of feces, the feeding habits of Rhinopithecus roxellana in Qianjiaping of Shennong
jia Nature Reserve in winter and spring were studied. In winter, the plants fed by R. roxellana included 15 species, belonging to 7 families and 9 genera, m
ainly Rosaceae, Usneaceae, Pinaceae, and Oleaceae; and in spring, the fed plants were comprised of 48 species, belonging to 25 families and 37 genera, mainlyRosaceae, Usneaceae, Cornaceae, Celastraceae, Lauraceae, Betulaceae, and Oleaceae. The food composition of R. roxellana in spring had significant positive correlations with the relative height, relative biomass, and relative richness and frequency of fed plants, and that in winter showed significant positive correlation with the relative biomass of the plants. Among the food composition of R. roxellana, the proportion of Usneaceae was higher in winter that in sprin
g, being 16.51% and 5.69%, respectively, suggesting that Usneaceae was only a remediation for food deficiency, but not the main feeding plant of R. roxellana in winter.

Key words: Ecosystem, Food nourishment, Different month aged sheep, Feed conversion rate