抄録
Cassava waste from the starch factory was used as the raw material in this study. This project aimed to apply solid-state fermentation to enrich protein in cassava waste and use it after fermentation as nitrogen source for animal feed production. The optimum condition from the laboratory experiment was applied in the 5 liter drum fermentation. The experiment was carried out in the systems of using one fungus, Rhizopus oligosporus, and two fungi, Rhizopus oigosporus and Rhizopus sp. 26R. As solid-state fermentation has to take place in the rather dry condition, therefore, cassava waste was dried. After that the moisture content of cassava waste was adjusted to 50% (dry weight) and autoclaved at 121deg;C for 15 minutes before transferring to the drum bioreactor. After 84 hours of fermentation, % amino acid in above both fermentation systems was analyzed and compared. Totally 17 different types of amino acid were found in different concentration. The data showed that glutamic acid was the highest at 1.25% and methionine was the lowest at 0.15% in the two fungi fermentation system. Finally, % urea, % protein and % fibre were analyzed and used as data to formulate animal feed formulation. From the balances of energy, protein and fiber content shows that the fermented cassava waste can be used as the nitrogen source substitution up to 40% in cow meal, 24.5% in pig meal, 20.0% in chicken meal and 17.3% in duck meal.
