Bioconversion of water hyacinth lignocellulose into feed supplement by lignocellulytic Streptomyces
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C. A. Etok and S. P Antai (2007). International Journal of Natural and Applied Sciences 2 (1): 14-22.
ABSTRACT
The bio-conversion of Eichhornia crassipes (MART) (water hyacinth) into feed supplement by some
Streptomyces species isolated from compost dump in Calabar was investigated. The proximate composition
analysis revealed 14% crude protein, 16.8% crude fibre, 7% crude fat, 8% ash content and 54.2%
carbohydrate. After fermentation for fourteen days, all the components decreased in composition except crudeprotein which increased from 14 to 21%. The toxicants were hydrocyanic acid (0.70mE), total and solubleoxalate (2.12mg, l.2lmg), phytic acid (0.274 mg) and tannins (0.038mg), per kg. All the toxicants showed a decrease in composition after fermentation. Of the four Streptomyces species studied for their ability to degrade water hyacinth lignocellulose, two, GS; and Sn had the highest lignocelulolytic activity. GS; and S1; produced a lignin loss of 20% and 27%’respectively, carbohydrate loss of 52% and 55%, lignocellulose weightloss of 47% and 48%, crude protein production of 15% and 14%, APPL production of 0.20 gram and 0.180 gram respectively. A consortium of these two isolates was used for fermentation of water hyacinth lignocellulose into protein feed supplement. A 20% level supplementation gave weight increases and an apparent digestibility of 87.23 in rats fed with the diets. The present study demonstrates the high potentials of Streptomyce: in converting lignocellulose waste into useful products.