Abstract This research aims to study the digestibility of silage with straw pulp using nylon bag technique. To develop an alternative roughage in the dry season. Using fermented 4 recipes including Formula 1, straw and pulp 10% Formula 2, straw, rice bran 5% and pulp 20% Formula 3 straw rice 5% and pulp 30% Formula 4. rice bran 5% and pulp 40% plan to completely randomized design (Complete Randomize Design: CRD) using Cattle Puppy breeding Brahman Trocar embedded Rumen fistula 3 or the slack nylon bag at 4, 8. , 12, 24 and 48 hours showed that the digestibility of dry matter was 54.69, 67.55, 75.88, 80.02 and 81.69 percent, respectively, from the analysis of the chemical composition of rice straw silage with cassava showed that T4 is volume. of dry matter 83.97 percent, followed by T3, T1 and T2 values of 81.78, 81.29 and 77.92 percent, respectively , organic matter, protein, fat, membrane, Selig's - cellulose and lignin were 81.29, 78.54, 3.00, 0.76. , 65.77, 52.46 and 10.13 percent, respectively, Straw, Rice bran 5%, tapioca flour and 20% (T2) has a value of 77.29, 73.63, 2.60, 0.90, 74.93, 43.56 and 19.93 percent, respectively, Straw, Rice Bran 5. +% tapioca flour and 30% (T3) has a value of 81.78, 78.35, 2.80, 0.25, 73.01, 51.28 and 14.84 percent, respectively, Straw, Rice bran 5%, tapioca flour and 40% (T4) has a value of 83.97. 86.64, 2.90, 0.63, 61.72, 50.36 and 11.79 percent respectively fermented rice straw pulp with all the quality is quite good because the average pH from 3.9 to 4.5 and a high digestibility of dry matter. Bringing straw silage with cassava to improve the quality, nutritional value and longevity to be preserved longer able to keep them in season forage shortages. It can also reduce agricultural residues that if left to cause pollution to the world Keywords: rice, cassava, nylon bag technique, cattle Trocar embedded Rumen fistula, digestibility.
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