Palm midrib can be used as animal feed by fermenting it into Complete Feed Blocks (CFB). Researchers studied the fermentation process and quality of digestibility in vitro. They ground the palm midrib with White Root Fungy, made CFB, and analyzed its components. The results showed that both formulas had similar effects on digestibility and ammonia concentration. CFB can be a good feed for ruminant animals, but quality and taste should be considered.