Oct 31, 2020 · The physicochemical compositions of cow manure and sheep manure showed that volatile solid (VS) contents were close to each other in manure compositions (77.6% and 64.7%, respectively), while the potential of methane production from cow manure (673.44 mL CH 4 /g VS) was greater than that from sheep manure (320.32 mL CH 4 /g VS).