acid detergent fiber content ACIDDETFIBR (related) A fiber content trait (TO:0002642) which is the proportion of fiber that is composed of cellulose and lignin and is highly indigestible or slowly digestible in a feed or forage. plant_trait_ontology Acid detergent fiber is composed of cellulose and lignin which are associated with low digestibility. The lower the acid detergent fiber, the more digestible the feed is and the higher the energy value of the feed. TO:0002641 ADF (related) fiber content trait