This study was conducted to determine the digestibility of Crude Protein (KcPK) and the digestibility of Crude Fiber (KcSK) of fermented oil palm leaves MA-11 with different incubation time treatments, namely 0 days, 3 days, 6 days, and 9 days. The observation data were processed using analysis of variance (ANOVA) from a Completely Randomized Design (CRD) and a follow-up test of Duncan's Multiple Range Test (DMRT). The study was arranged with four-way repetitions, namely T0: fermented oil palm leaves MA-11 for 0 days, T1: fermented oil palm leaves MA-11 for 3 days, T2: fermented oil palm leaves MA-11 for 6 days, and T3: fermented oil palm leaves MA-11 for 9 days. The results showed that the highest digestibility of crude protein in fermented oil palm leaves MA-11 was at T3, 58.11%, and the lowest at T0, namely 19.48%. The highest digestibility of crude fiber from MA-11 fermented oil palm leaves was found in T3 at 67.08% and the lowest at T0 at 57.54%. Fermented oil palm leaves using 6 ml of MA-11 and incubated for 0 days, 3 days, 6 days, and 9 days significantly increased crude protein and fiber levels on the longest day.
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