Dry Anaerobic Digestion of Chicken Manure: A Review - MDPI. Chicken manure co-fermentation regularly has better results than chicken manure fermentation as a monosubstrate. The low methane yield was observed only for studies that used switchgrass (2 mL/g VS) , straw (4.34 mL/g VS) , and glycerol after biodiesel production (6.34 mL/g VS) .