PURPOSE: To accomplish mass production at low cost a feed good in digestibility and absorbability by treating protein-contg. soybean oil refuse with a proteinase under specified conditions followed by drying under a specified water content.
CONSTITUTION: Pref. 0.005-0.5wt.% of a proteinase is added to soybean oil refuse pref. ≥40wt.% in protein content and ≤1% in oil content with the inhibitor contained deactivated by heat treatment, and the resulting system is brought to such a state as to be fluidized with a flaky or powdery form retained at a water content of 20-50wt.%, and treated under mixing at pref. 40-60°C for 20min to 2hr so that the increasing rate of water-soluble nitrogen based on the whole nitrogen [represented by the formula (SN2 is amount of water-soluble nitrogen after degradation; SN1 is amount of water-soluble nitrogen before degradation; TN is the whole amount of nitrogen)] fall between 10 and 50%, and the product is dried at pref. 75-85°C until the water content comes to ≤12wt.%, thus obtaining the objective feed.
SHIRAKAWA YOICHI
TOKORO TAKASHI
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