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Quercus serrata Thunb. is the primary food plant of oak tasar silkworm Antheraea proyeli Jolly. The chemical constituents of leaf i.e. crude protein, crude fibre, crude fat, carbohydrates were estimated in different seasons i.e. spring and autumn. Bioassay were also conducted in spring and autumn season. In spring leaf moisture, crude protein, crude firbe, crude fat, ash, carbohydrates and ERR% were recorded 68.98%, 10.28%, 6.78%, 2.34%,1.88%, 10.80% and 64.50% respectly. During autumn season the leaf moisture 57.23%, crude protein 5.13%, crude fibre 7.09%, crude fat 1.94%, ash1.90%, carbohydrates 21.33% and ERR 31.60% were recorded from Oak leaves. In spring season higher leaf moisture, crude protein and ERR% were observed while in autumn season less % leaf moisture and ERR% but higher % of carbohydrates were recorded. There were no significant different observed for crude fibre, crude fat and ash% content in both the season.
Key words: Chemical constituents, Quercus serrata, Antheraea proylei.