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Researchers Compare LCAs for Animal Products

03 June 2010

NETHERLANDS - A first review of Life Cycle Assessments (LCA), conducted at Wageningen University, confirmed that the production of one kilo of beef used most land and energy, and had highest global warming potential (GWP), followed by production of the same quantity of pork, chicken, eggs and milk.

Livestock production has a major impact on the environment. Choosing a more environmentally friendly livestock product in a diet can mitigate environmental impact, according to a new paper published in Livestock Science.

The objective of this research, according to its authors, M. de Vries and I.J.M. de Boer of Wageningen University, was to compare assessments of the environmental impact of livestock products. Twenty-five peer-reviewed studies were found that assessed the impact of production of pork, chicken, beef, milk, and eggs using life cycle analysis (LCA). Only 16 of these studies were reviewed, based on five criteria: study from an OECD (Organization for Economic Cooperation and Development) country, non-organic production, type of LCA methodology, allocation method used, and definition of system boundary. LCA results of these 16 studies were expressed in three ways: per kg product, per kilo of protein, and per kilo of average daily intake of each product for an OECD country.

The researchers say that the review yielded a consistent ranging of results for use of land and energy, and for climate change. No clear pattern was found, however, for eutrophication and acidification.

Production of one kilo of beef used most land and energy, and had highest global warming potential (GWP), followed by production of one kilo of pork, chicken, eggs and milk.

Differences in environmental impact among pork, chicken, and beef can be explained mainly by three factors:

  • differences in feed efficiency
  • differences in enteric methane emission between monogastric animals and ruminants, and
  • differences in reproduction rates.

The impact of production of one kilo of meat (pork, chicken, beef) was high compared with production of one kilo of milk and eggs because of the relatively high water content of milk and eggs. Production of one kilo of beef protein also had the highest impact, followed by pork protein, whereas chicken protein had the lowest impact.

This result also explained why consumption of beef was responsible for the largest part of the land use and GWP in an average OECD diet.

This review did not show consistent differences in environmental impact per kilo of protein in milk, pork, chicken and eggs. Only one study compared environmental impact of meat versus milk and eggs.

Conclusions regarding impact of pork or chicken versus impact of milk or eggs require additional comparative studies and further harmonization of LCA methodology.

Interpretation of current LCA results for livestock products, moreover, is hindered because results do not include environmental consequences of competition for land between humans and animals, and consequences of land-use changes. The authors recommend, therefore, to include these consequences in future LCAs of livestock products.

Reference

de Vries, M. and I.J.M. de Boer. 2010. Comparing environmental impacts for livestock products: A review of life cycle assessments. Livestock Science, 28 (1): 1-11.

Further Reading

- You can view the full report (fee payable) by clicking here.

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