Evaluation of Nutritional Content of Total Mixed Ration (TMR) Based on Rice Straw Fermented with Saccharomyces cerevisiaeAbstract
Adyatma Rijal Rasyid1, Nuaf Praditya1, Desta Rahmania Syafitri1, Ramdhan Wardianto1, Nisrina Fathina Haura1, Asri Nurul Huda1

1Department of Animal Science, Faculty of Animal Husbandry, Universitas Brawijaya 65145

Abstract

East Java is one of the largest contributors of agricultural land in Indonesia, accounting for 25% of the country^s total agricultural land. The area of rice cultivation land in East Java reaches 1.62 million hectares. The utilization of rice straw is still not optimal due to public concerns in processing rice straw, as it contains high levels of lignin, cellulose, and hemicellulose. The use of urea in fermented rice straw is still debated by the public due to fears that urea may poison livestock. Substituting urea with Saccharomyces cerevisiae as the fermentation agent for rice straw is considered capable of improving the nutritional quality of rice straw, and with the addition of concentrate, it can be formulated into Total Mixed Ration (TMR). The observation of nutritional quality was conducted at the Animal Nutrition Laboratory, Faculty of Animal Husbandry, Universitas Brawijaya, and the Sumber Sekar Field Laboratory, Faculty of Animal Husbandry, Universitas Brawijaya, from September 12 to November 1, 2025. The materials used in this study were rice straw, yeast (Saccharomyces cerevisiae), concentrate (SMG Mixfeed S18), pH buffer, distilled water, H2SO4 solution, NaOH solution, and Na2SO3 solution. The tools used in this research included plastic bags, a digital scale (0.01), scissors, adhesive tape, pH meter, thermometer, chopper, label paper, porcelain crucibles, desiccator, furnace, tongs, AI-disk, catalyst, dispenser, Erlenmeyer flask, measuring glass, and crucible. The complete feed rations were formulated into T1, T2, T3, and T4. All stages of the study were conducted at the nutrition laboratory, including problem analysis, physical quality observation, improvement of rice straw nutrition, and reduction of fiber content. Rice straw showed an increase in nutritional quality, especially in crude protein. The crude fiber of rice straw decreased, making it suitable for livestock feed. The highest crude protein content of complete feed based on fermented rice straw was found in T2, with 12.25% crude protein. The highest crude fiber content was also in T2, with 20.82%. Thus, the T2 complete feed was the best, producing the highest crude protein content and the lowest crude fiber content.

Keywords: rice straw, Saccharomyces cerevisiae, concentrate, complete feed, nutritional content

Topic: Animal Nutrition