In the present study oyster mushroom cultivated on two substrates like wheat straw and
brassica straw was used for evaluating their nutrient compositions. Moisture content of both
types of mushroom was 89.68 and 88.98% on fresh weight basis which differed non-significantly.
Similarly, non-significant difference was also observed in crude fibre, crude fat, ash and energy
contents, whereas significant difference was noticed in crude protein (25.30 and 26.99%) and
total carbohydrates (52.34 and 50.52%). Both types of mushroom exhibited good amount of
vitamins, amino acids and dietary fibre. The values were reported for thiamine (1.18 and 1.13
mg/100 g), riboflavin (3.89 and 3.52 mg/100 g), lysine 6.00 and 6.25 g/100 g protein) and
methionine (1.80 and 1.75 mg mg/100 g) on dry matter basis of wheat and brassica straw grown
mushroom, respectively. Total, soluble and insoluble dietary fibre varied between 15.60 and
13.73, 1.63 and 1.58 and 13.97 and 12.15 g/100 g, respectively. Brassica straw grown oyster
mushroom exhibited significantly higher contents of protein, riboflavin, lysine and methionine
whereas wheat straw grown mushroom contained significantly higher contents of thiamine and
dietary fibre. The variations in nutrient composition of oyster mushroom are likely to be due to
variation in substrate composition.