Botanical and chemical compositions of the rumen contents of 58 Sika deer on Mt Goyo, northern Japan, collected from summer of 1988 to spring of 1989, were analyzed.Sasa nipponica, a dwarf bamboo, was important in summer (35.0) and winter (61.4), but it decreased to 5.6 and was replaced by browse leaves in fall, and to 28.0 and was replaced by dead leaves, twigs and bark of woody plants in winter. Crude protein was 20–25 lower in the washed fraction than in the gross fraction. It was highest (16.2) in summer and lowest (8.6) in winter. High protein content in summer and fall foods was attributed to forb and browse leaves. Seasonal fluctuation in protein content in the foods of these Sika deer was greater than red deer on Rhum, Scotland and smaller than wapiti in Yellowstone National Park, Wyoming, USA. Climatically, winter severity of Mt Goyo is intermediate between the two localities, which seems to explain the seasonal fluctuation of the protein level. Crude fiber wasca33 in the ‘washed’ fraction, and did not change seaso
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