Fungi especially moulds have the potentials of degrading Cellulosic materials with the aid of their extra cellular producing cellulase for energy sources. These potentials can be economically harnessed for possible application in animal feed formulation. The effects of biodegradation of cassava root peel and sieviate by Aspergillus spp at varied substrate concentration and fermentation time on their proximate content were investigated. In the present studies, pure cultures of Aspergillus niger and Aspergillus oryzae were isolated from spoilt cassava waste sample using Sabouraud dextrose Agar. In each Investigation, the cassava root peel and sieviate powder were weighed out in duplicate samples of 2.0 gramme, 4.0gramme and 6.0 gramme each in a glass Petri dish and mixed with 10ml of 10% sucrose solution containing the fungal biomass. Each sample was subjected to solid state fermentation for 6,8 and 10 days at 35oC in an incubator .The result of the studies showed that the crude protein and ash content increased with the increase in fermentation time and substrate concentration while the crude fiber and total carbohydrate decreased relatively with the increase in fermentation time and substrate concentration. The highest value of 15.80% crude protein and 3.30% ash and lowest value of 7.8% crude fiber and
8.0% total carbohydrate was obtained in 10 days fermentation time and substrate concentration of 6.0 g/10ml for cassava root peel. Likewise, the highest value of 9.40% crude protein and 3.74% ash and lowest value of 8.20% and 9.80% was obtained for crude fiber and total carbohydrate respectively at substrate concentration of 6g/ 10ml and 10 days fermentation time for cassava root sieviate (CRS). The results have shown that fermentation of cassava root peel and sieviate could improve the nutritive value of these wastes with special reference to the crude protein and ash content. The decrease in crude fiber and total carbohydrate with fermentation time could improve the digestibility of these wastes if used in animal feed formulation. The analysis of variance (ANOVA) of the results obtained at 95% confidence level showed that the increase in crude protein and ash content and reduction in crude fibre and total carbohydrate was significantly (P≤ 0.05) dependent on fermentation time and substrate concentration. 

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