Efficient production of l-lactic acid from chicken feather protein hydrolysate and sugar beet molasses by the newly isolated Rhizopus oryzae TS-61

► Chicken feather protein (CFP) hydrolysate had rich protein, mineral and amino acid contents. ► CFP had potential to prevent excessive pH changes and foaming. ► CFP provide smaller uniform pellet formation in during fermentation. ► CFP can result in higher l-lactic acid production than yeast extract and ammonium sulfate. ► CFP is very cheap, since it is produced from waste chicken feathers.