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Under the United Nations Framework Convention on Climate Change (UNFCCC), the Kyoto-protocol is aimed at reducing the emission of greenhouse gases. Therefore, members report their greenhouse gas (GHG) emissions every year in a National Inventory Report (NIR). For agriculture the Netherlands identify three sources of GHG: enteric fermentation (methane), manure management (methane and nitrous oxide) and agricultural soils (nitrous oxide). The Dutch NIR reported that in 2009 23% of the agricultural GHG was caused by manure management. The methane-emission factors for manure management were assessed by a Tier 2 approach, the nitrous-oxide-emission factors were IPCC 2000-defaults. Between 2008 and 2010 an extensive measuring programme was carried out resulting in emission factors for housing systems of methane and nitrous oxide. Overall it appeared that emission factors of …