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Improvement of the quality of rumen food must be supported by improvements that support bioprocess in the rumen because rumen is the largest part of the digestive system of ruminants. Nutrition addition is a must if the ration used is fibrous waste such as fermented rice straw. Feed processing technology must be integrated with the nutrient addition of microbial biomass synthesis precursors, such as nitrogen, sulfur, macro minerals and energy, and long-chain fatty acids. This research was conducted to evaluate the utilization of fermented rice straw biomass using soybean oil addition on digestibility, feed efficiency and daily gain in local sheep. Eighteen, male local sheep aged 6-8 months with an average live weight of 22.31 ± 2.20 kg, were fed with 15% rice straw and 85% concentrate as the basic feed. The study was conducted with an experimental method in vivo. The adaptation period was carried out for 2 weeks, preliminary for 21 days and a collection period of 5 days using individual cages. Three diet treatments were supplemented control 0% (R1), supplement with 3% soybean oil (R2) and supplement with soy oil 6% (R3) of total dry matter intake. The parameters measured were dry matter digestibility, organic matter, and daily gain. Based on the results of the study it can be concluded that the addition of 6% soybean oil in the sheep feed, with the balance of 15% fermented rice straw and 85% concentrate did not affect and interfere with the digestibility of dry matter and organic matter, and did not significantly influence the daily gain and efficiency of sheep feed.

Utilization of fermented rice straw biomass and soybean oil supplementation on digestibility, efficiency, and the bodyweight of local sheep