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The possibility of upgrading spent sorghum grains to chicken feed through microbial processing was investigated. Spent sorghum grains (SSG) were fermented for a period of 21 days at 25 ± 2 o C using a consortium of A. niger, C. globosum and S. cerevisiae. The effects of microbial processing on the nutrient composition of the SSG were assessed and the nutrient composition of the microbe-processed product was compared with the nutrient requirements of chicken. Fermentation led to increases in the contents of crude protein (56%), crude fat (59.65%) and ash (38%). Crude fibre and NFE contents were decreased by 24.84% and 35.43% respectively. Energy content increased by 7.8%. The percent dry matter values of fifteen amino acids ( lysine, histidine, arginine, aspartic acid, glutamic acid, proline, glycine, alanine, cystine, valine, methionine, isoleucine, leucine tyrosine and phenylalanine) were found to increase. Elemental analysis revealed increases in the values of calcium, phosphorus, potassium and iron, and decreases in the values of magnesium, manganese, copper and zinc. Microbial processing with the test organisms generally enhanced the nutritional quality of SSG, but for it to be used as chicken feed, there is need for further fibre reduction, energy enhancement and mineral supplementation.

Microbial Processing Of Spent Sorghum Grains for Possible Use as Chicken Feed