| Summary: | This research was conducted to determine the effect of fermentation duration of aren stem waste on chemical composition and in vitro digestibility. In the begining of
fermentation, 0.3 g biostarterand 1.2 g urea was added to 300 g aren stem waste. Fermentation was conducted anaerobically at room temperature for 10, 20, 30, 40 d with
three replicates for each treatment. The samples of fermented aren stem waste were analyzed physical quality (texture, odor, color, growth of fungi and pH), chemical composition, and in vitro digestibility. The data obtained were analyzed variance following one-way design, and
continued by Duncan’s new multiple range tests for any differences between treatments. Results showed that fermentation gave soft texture, more acidic odor, and dark brown color than fresh aren stem waste. The fermentation decreased pHof aren stem waste up to less than 4.2 (P<0.01) at 20, 30, and 40 d (4.2, 3.82 and 4.17). The chemical composition of fermented aren stem waste increased after a longer fermentation time.While crude fiber content
decreasedwhen a longer fermentation time with the lowest value 31.57%(P<0.01) at 40 d of fermentation time. After 30 d of fermentation, dry matter, organic matter, and crude fiber digestibility increased 12.84%, 17.18%, and 20.91% respectively compared to 10 d of fermentation time (P<0.01).It could be concluded that 30 d was the most effective of fermentation duration of aren stem waste which increased chemical composition and in vitro digestibility.
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