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Environmental impacts along intensity gradients in Norwegian dairy production as evaluated by life cycle assessments

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  • Bakken, Anne Kjersti
  • Daugstad, Kristin
  • Johansen, Astrid
  • Hjelkrem, Anne-Grete Roer
  • Fystro, Gustav
  • Strømman, Anders Hammer
  • Korsaeth, Audun

Abstract

The aim of the study was to explore whether and how intensification would contribute to more environmentally friendly dairy production in Norway. Three typical farms were envisaged, representing intensive production strategies with regard to milk yield both per cow and per hectare in the three most important regions for dairy production in Norway. The scores on six impact categories for produced milk and meat were compared with corresponding scores obtained with a medium production intensity at a base case farm. Further, six scenario farms were derived from the base case. They were either intensified or made more extensive with regard to management practices that were likely to be varied and implemented under northern temperate conditions. The practices covered the proportion and composition of concentrates in animal diets and the production and feeding of forages with different energy concentration. Processes from cradle to farm gate were incorporated in the assessments, including on-farm activities, capital goods, machinery and production inputs. Compared to milk produced in a base case with an annual yield of 7250kg energy corrected milk (ECM) per cow, milk from farms with yields of 9000kg ECM or higher, scored better in terms of global warming potential (GWP). The milk from intensive farms scored more favourably also for terrestrial acidification (TA), fossil depletion (FD) and freshwater eutrophication (FE). However, this was not in all cases directly related to animal yield, but rather to lower burden from forage production. Production of high yields of energy-rich forage contributed substantially to the better scores on farms with higher-yielding animals. The ranking of farms according to score on agricultural land occupation (ALO) depended upon assumptions set for land use in the production of concentrate ingredients. When the Ecoinvent procedure of weighting according to the length of the cropping period was applied, milk and meat produced on diets with a high proportion of concentrates, scored better than milk and meat based on a diet dominated by forages. With regards to terrestrial ecotoxicity (TE), the score was mainly a function of the amount of concentrates fed per functional unit produced, and not of animal yield per se. Overall, the results indicated that an intensification of dairy production by means of higher yields per animal would contribute to more environment-friendly production. For GWP this was also the case when higher yields per head also resulted in higher milk yields and higher N inputs per area of land.

Suggested Citation

  • Bakken, Anne Kjersti & Daugstad, Kristin & Johansen, Astrid & Hjelkrem, Anne-Grete Roer & Fystro, Gustav & Strømman, Anders Hammer & Korsaeth, Audun, 2017. "Environmental impacts along intensity gradients in Norwegian dairy production as evaluated by life cycle assessments," Agricultural Systems, Elsevier, vol. 158(C), pages 50-60.
  • Handle: RePEc:eee:agisys:v:158:y:2017:i:c:p:50-60
    DOI: 10.1016/j.agsy.2017.09.001
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    References listed on IDEAS

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    1. Thomassen, M.A. & Dolman, M.A. & van Calker, K.J. & de Boer, I.J.M., 2009. "Relating life cycle assessment indicators to gross value added for Dutch dairy farms," Ecological Economics, Elsevier, vol. 68(8-9), pages 2278-2284, June.
    2. Korsaeth, Audun & Henriksen, Trond Maukon & Roer, Anne-Grete & Hammer Strømman, Anders, 2014. "Effects of regional variation in climate and SOC decay on global warming potential and eutrophication attributable to cereal production in Norway," Agricultural Systems, Elsevier, vol. 127(C), pages 9-18.
    3. Flaten, O. & Bakken, A.K. & Randby, Å.T., 2015. "The profitability of harvesting grass silages at early maturity stages: An analysis of dairy farming systems in Norway," Agricultural Systems, Elsevier, vol. 136(C), pages 85-95.
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    Cited by:

    1. Elio Romano & Rocco Roma & Flavio Tidona & Giorgio Giraffa & Andrea Bragaglio, 2021. "Dairy Farms and Life Cycle Assessment (LCA): The Allocation Criterion Useful to Estimate Undesirable Products," Sustainability, MDPI, vol. 13(8), pages 1-24, April.
    2. Ellen Cecilie Andresen & Anne-Grete Roer Hjelkrem & Anne Kjersti Bakken & Lene Frost Andersen, 2022. "Environmental Impact of Feeding with Infant Formula in Comparison with Breastfeeding," IJERPH, MDPI, vol. 19(11), pages 1-15, May.
    3. Olkkonen, Ville & Lind, Arne & Rosenberg, Eva & Kvalbein, Lisa, 2023. "Electrification of the agricultural sector in Norway in an effort to phase out fossil fuel consumption," Energy, Elsevier, vol. 276(C).

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