Ensiling as an innovative biotechnological approach for conservation of high cyanide cassava tubers for feed use
1995
Padmaja, G. | George, Mathew | Balagopalan, C.
A major disadvantage in ensiling cassava roots is the production of large quantities of effluent which ultimately reduces the nutrient quality and shelf life of silage. A technique was perfected to obtain stable quality silages from whole cassava roots through the use of effluent absorbents like rice straw and cassava starch factory waste (CSFW). The most feasible combinations to obtain silages with good shelf life were cassava roots: rice straw (90:10) and cassava roots: CSFW (80:20). There was a rapid fall in pH within 2 days of ensiling itself resulting from a high lactic acid production. After 72 days of ensiling, the Ph values ranged from 3.6-4.0 units and the lactic acid levels were 4.8-11.4 g 100 9-1 DM. Amino acid profiles of the modified silages indicated that there was good conservation of amino acids during ensiling. The mode of cyanoglucoside hydrolysis during ensiling was studied using a high cyanide cultivar, H 165. Although the total cyanide reduced from 450 to 368 mg HCN k(-1) DM only during a siling period of 33 days, there was almost 50 percent reduction in the bound glucoside. The acid Ph prevailing in the silages retarded the hydrolysis of acetone cyanohydrin to free cyanide. Initial cyanide load entering the silo could be reduced by exposing the roots at ambient temperature or to sunlight for 4 h. The retention of bound cyanide in such treated silages was lesser than in the untreated silages. Further detoxification could be done through either boiling the silage for 10 min in water or sun-drying the silage.
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