Anne-Grete Roer'Correspondence information about the author Anne-Grete RAnne-Grete Roer, Astrid Johansen, Anne Kjersti Bakken, Kristin Daugstad, Gustav Fystro og Anders Hammer Strømman
To document the impact and to be able to compare the findings to results from previous studies, processes often excluded in literature were individually omitted from the assessment. The consequences of using alternative literature values for selected sub-processes were calculated and the sensitivity of the results to different parameter settings was evaluated by varying the parameter values ±50% of the default value.
GWP impacts of 1.5–1.6 kg CO2-eq per kg energy corrected milk (ECM) and 17.7–18.4 kg CO2-eq per kg carcass were calculated. By excluding production of machinery, buildings, medicines, detergents, seeds, fence and pesticides, the GWP impacts were reduced by approximately 8% per kg carcass and 9% per kg ECM. Compared to results from other studies, the GWP related to production of milk and meat was high in the present investigation. The validity of comparisons with other studies is however low due to differences in allocation and system boundaries.
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