The invention provides a
protein feed prepared by adopting
rapeseed dregs, which can effectively reduce the
glucosinolate content in the
rapeseed dregs by more than 65%. The preparation method for preparing
protein feed by the
rapeseed dregs comprises the following steps: (1) crushing the rapeseed dregs into rapeseed dreg
powder; (2) preparing strains; (3) uniformly mixing and stirring 94-96% of rapeseed dreg
powder, 1-3% of modifier, 3-4% of wheat
bran, and the strains with
clean water, wherein the modifier is formed by mixing 0.1-0.5% of KH2PO4, 0.2-1.5% of
urea, 0.05-0.2% of MgSO4, 0.1-0.6% of CuSO4*5H2O,
corn flour and / or washing rice
bran; (4) filling the uniformly stirred leavening in a
fermentation koji tray and arranging the
fermentation koji tray on a
fermentation koji tray rack; and (5) controlling fermentation temperature to be 28-35 DEG C and fermentation time to be 32-48 hours. The prepared
protein feed reduces the
glucosinolate content in the original rapeseed dregs by more than 65%, reaches the
protein content to 44%, obviously improves the
palatability, further rationalizes the
amino acid structure, is more beneficial to the digestive absorption of beasts and birds, and has higher feeding value.