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For the preparation of fermented feed with Lyophyllum decorates, optimum cultural conditions for the production of cellulase were 30℃, pH 6.0, 60-70% moisture content and the cultural of 15 days. Among the submaterial added, 30-40% of rice bran and 0.72% of (NH₄)₂HPO₄, were effective for the cellulase production and its production increased when rice straw treated with 4% alkaline peroxides. Solid state fermentation of rice straw with Lyophgllum decorates for 40 days removed 19.9% of lignin, and increased the total nitrogen content to 1.6% from 1.1%. As the fermentation proceeded, the in vitro dry matter digestibility of fermented feed was increased and it increased 21.1% after 35 days.
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