Bioconversion of Yam Peels by Aspergillus niger and Pleurotus ostreatus into Improved Animal Feed
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Authors
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Albert Doughan
Kwame Nkrumah University of Science and Technology
Keywords:
Solid state fermentation, Animal feed, Bioconversion, Lignocellulose, Pleurotus ostreatus, Aspergillus nigerAbstract
The study was carried out to assess the effect of fermentation on the proximate composition of yam peels with the aim of producing an improved animal feed. Yam peels were milled, sterilized and subjected to incubation with Pleurotus ostreatus and Aspergillus niger for a period of eight weeks. Fermented and unfermented yam peels were produced, and standard procedures used to determine their proximate composition and extent of tannin degradation. Fermentation resulted in a significant increase (p < 0.05) in crude protein, ash and carbohydrate, whereas there was a significant decrease (p < 0.05) in crude fiber. The protein content increased by 34.9% and 55.6%, Ash, 60% and 80%, carbohydrates, 28.1% and 22.7% for A. niger- and P. ostreatus-treated substrates respectively. The crude fiber also decreased by 60.6% and 55.8% for A. niger- and P. ostreatus-treated substrates respectively. Qualitatively, tannin levels also decreased with fermentation time. Biological treatment of yam peels by fermentation with Pleurotus ostreatus and Aspergillus niger significantly improved the nutritive value of yam peels, thus its potential usage in the production of animal feed for monogastrics.
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