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Generally, sheep are capable to consume the forage about 90 percent of their dry matter requirement. InIndonesia, sheep generally accumulated in low land area, so that the requirement to be supply by dried field grass only. Anexperiment has been conducted at the Experimental Farm, Faculty of Animal Science, General Soedirman University.Twenty seven male sheep were used in a Completely Randomized Block Design of three replication. The factors testedwere: three levels of dried field grass at: 0, 21.25 and 42.50 percent dry matter of ration. The variables measured were: (1)crude fiber digestion coefficient; (2) Rumen metabolism product: volatile fatty acids, especially acetate (C2), propionate(C3), butyrate (C4), and valerate (C5). The digestion trial was carried out by the Total Collection methods and theproductions of individual volatile fatty acids were determined by chromatography technique. The analysis of covarianceshown, that there was no significantly effects of treatment tested upon the crude fiber digestion coefficient (P>0.005), butthere were a highly significant effect (P
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