This paper illustrates the necessity to use a holistic perspective when striving to assess the environmental performance of a livestock production system. It elaborates on the methodological dimension of livestock- related LCAs, i.e. it describes the essential environmental impacts categories to include, the stages of the livestock system to comprise and the effects on adjoining systems like energy and fertilizer production to account for. Further, it explains the comparative nature of environmental assessment and how to use reference systems as the basis of comparison of alternative techniques. It illustrates a Danish example of establishing data of such reference systems. Finally, it provides an overview of approaches used to estimate emissions based on knowledge of manure composition throughout the stages of the livestock production system.
Ktbl Tagung 2011. Emissionen Der Tierhaltung: Treibhausgase, Umweltbewertung, Stand Der Technik, 2011