Methane is produced during anaerobic decay of the organic material in livestock manure. It is emitted from manure if fermentation takes place over longer periods in anaerobic liquid or slurry storage. The optimum temperature is 15-35°C. Manure can also be stored dry and cool, to prevent fermentation. Manure management varies in different regions of the world. Therefore a reduction is only expected in regions with high animal densities where liquid/slurry storage is practised. A reduction of about 10 per cent can be achieved in those regions, with a cost of US$200 per tonne of avoided CH4 (AEAT, 1998).
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