Increasing nutrient quality and in vitro digestibility of mixed feed oil palm waste for ruminant feed by solid-state fermentation technology

Palm oil cake (BS) and Solid ex decanter (SD) are feed ingredients produced from palm oil processing which is available in large quantities. BS and SD have high protein content could be used as ruminant feed but have high fat content could be decreased rumen metabolism. Therefore. solid-state fermentation (SSF) technology is one way to overcome this problem. This study aims to improve the nutritional quality and digestibility of mixed feed palm oil cake and solid ex decanter (BS/SD) which is fermented by Rhizopus oligosporus (RO) mushroom. Application SSF technology for different combination of mixed feed BS/SD (70/30, 50/50 and 30/70) was carried out for 6 days which was then analyzed on the quality of the proximate. fiber fractions and in vitro true dry matter digestibility (IVTDMD) value (daisy incubator ANKOM Technology). The result showed that the mixed feed BS/SD 50/50 was the best combination with Rhizopus oligosporus inoculum with doses of 0.2, 0.4 and 0.8%. Hence, this SSF technology was effective process for increasing protein content and in vitro true dry matter digestibility (IVTDMD) 60% - 67.26% with combination BS/SD 50/50 and RO inoculum with doses 0.2 and 0.4 percent.