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* [3.1 Tier 3: dairy cows and suckler cows](3-Enteric-fermentation/3.1-Tier-3-Dairy-cows-and-suckler-cows)
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* [3.2 Tier 2: other cattle, pigs](3%20Enteric%20fermentation/3.2%20Tier%202%20other%20cattle,%20pigs)
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* [3.3 Tier 1: goats, sheep, horses](3%20Enteric%20fermentation/3.3%20Tier%201%20goats,%20sheep,%20horses)
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* [3.3 Tier 1: other animals](https://git-dmz.th3-Enteric-fermentation/3.3-Tier-1-other-animals)
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The calculation of methane emissions from enteric fermentation can be performed according to three different levels of complexity (Tiers), see [IPCC(2006)](/9%20Literature#ipcc-intergovernmental-panel-on-climate-change-2006)-10.24 ff. For details of the procedures applied see the respective animal category chapters. The choice of the complexity level depends on whether the animal category under consideration is considered a key source with respect to methane emissions from enteric fermentation. If this is the case, a Tier 2 or Tier 3 method has to be used.
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