This study aims to determine the total production of biogas, anaerobic bacterial counts, and the rate of biogas production with the addition of rice husk in cattle fecal material. The research was carried out on October 9, 2010 through June 14, 2011 in Dairy Cattle Science Laboratory, Faculty of Animal Science, Diponegoro University, Semarang. Research materials in the form of fresh feces of cattle by 200 males Java g biogas as the main ingredient, rice husks as much as 8.46 g of additional material, and as much water as a diluent 385.09 g stuffing materials digester. The equipment used is a set of tools digester, pH meter, thermometer, electric scales, aluminum foil, buckets, stirrers, measuring cups and shots. Experiments using completely randomized design (CRD) consisting of 2 treatments and 4 replications. Treatment is T0 (control) with stuffing materials 100% feces and T1 (treatment) with stuffing materials feces and rice hulls. Observed variables include the total gas, total anaerobic bacteria, and the rate of gas production. The data were tested by t test. The results showed that the addition of rice husk in biogas stuffing materials not significant (P> 0.05) on the production of gas and the gas production rate, whereas total anaerobic bacteria showed that there were significant effects (P <0.05). The average biogas production is 206.875 ml for 28 days at T0 and T1 243.75 ml. Total anaerobic bacteria in T0 (control) 0.75 × 107 cfu / g lower (P <0.05) than T1 (treatment) 3.24 × 107 cfu / g. Rice husks can not be used as an additive in the feces of beef cattle to produce biogas.
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