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Abstract. This study aims to determine the quality crude protein and crude fiber content of complete feed based on rice straw fermented with rations in Effective Microorganism (EM-4). This research has been carried out at the Laboratory of Feed Technology and Industry, Faculty of Animal Husbandry, Hasanuddin University, then proceed with proximate analysis at the Feed Nutrition Laboratory, lasting for 2 months. This study used an experimental method with a completely randomized design (CRD) consisting of 4 treatments and 3 replications. with the following composition, T1 = 0% concentrate + (79% Fermented rice straw + 10% Bran + 10% Molasses + 1% Urea), T2 = 25% Concentrate + 75% T1, T3 = 50% Concentrate + 50% T1 and T4 = 75% Concentrate + 25% T1. The variables measured were dry matter, crude protein, and crude fiber. Data were analyzed by analysis of variance and further tested by Duncans Multiple Range Test. The results showed that the quality of the complete proximate wafer content of rations could be improved by using rice straw as an effective Microorganism-4 fermented product. The quality of proximate content that is meant is dry matter, crude protein and reduction in crude fiber content.