This purpose of this study was to determine the degradation pattern of Acid Detergent Fiber (ADF) on three of swamp grasses Kumpai Tembaga (Hymenachne acutigluma), Kumpai Minyak (Hymenachne amplexicaulis) dan Kumpai Padi (Oryza rupifogon) on swamp buffalo by in sacco. This research was conducted from February to June 2020 at the Experimental Laboratory and Animal Nutrition and Forage Laboratory…