“…In manure, the CH 4 production is promoted by lack of oxygen, high temperature, high level of degradable OM, high moisture content, low redox potential, neutral pH and C/N ratio between 15 and 30 . According to the guidelines for National Greenhouse Gas Inventories (IPCC, 2006), CH 4 emissions from manure (CH 4, Manure , in m 3 ) can be estimated based on the amount of excreted OM, in kg; the ultimate CH 4 potential (B 0 ), in m 3 per kg OM; and the methane conversion factor (MCF), in percentage: In a study conducted on slurry samples from pigs fed diets with different fibre contents, B 0 values around 0.46 m 3 per kg OM were reported whatever the diet composition (Jarret et al, 2011a). In a similar experiment, extreme MCF values were observed, ranging from 1.3% to 85.4% according to manure type, manure management, storage duration and fibre content (Jarret et al, 2011b).…”