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In these studies, attempts were made to investigate the bio-conversion of sorghum and rice straw into value-added ruminant feed using Pleurotus pulmonarius in solid state fermentation over a period of forty days. Samples were withdrawn every 10 days and analysed for chemical composition such as crude protein, cellulose, hemicelluloses, crude fats and neutral detergent fibre. The results obtained show a high positive correlation in the degradation of sorghum stalk and rice straw with an increase in the fermentation period. Sorghum stalk showed high digestibility compared to rice straw used for this study. The chemical composition results showed significant differences of (P< 0.05), and high digestibility for the two substrates as the days of fermentation increases. Bioconversion of sorghum stalk and rice straw into value added ruminant feed using Pleurotus pulmonarius. Nature and Science 2012; 10 (4): 10-16].(ISSN: 1545-0740). http://www. sciencepub. net/nature. 2