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Environmental consequences of pig production scenarios using biomass from rotational grass-clover leys as feed
SLU Swedish University of Agricultural Sciences, Sweden.ORCID iD: 0000-0002-7333-3610
RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.ORCID iD: 0000-0002-1260-4835
SLU Swedish University of Agricultural Sciences, Sweden.ORCID iD: 0000-0002-0616-7763
SLU Swedish University of Agricultural Sciences, Sweden.
2023 (English)In: Environmental Technology & Innovation, ISSN 2352-1864, Vol. 30, p. 103068-103068, article id 103068Article in journal (Refereed) Published
Abstract [en]

Production of pork based on monoculture cereal-based cropping systems causes substantial environmental pressures and feed-food competition. This study evaluated the environmental consequences of five different scenarios involving inclusion of rotational grass-clover leys and incorporation of grass-clover biomass in pig diets: (1) a conventional reference scenario without grass-clover biomass; (2) a conventional scenario with replacement of feed with grass-clover silage in a total mixed ration, i.e., with grass-clover biomass replacing other feed; (3) an organic scenario using grass-clover silage for enrichment purposes only; (4) an organic scenario using grass-clover silage for enrichment purposes and additional grass-clover leys for green manuring; and (5) an organic scenario using grass-clover silage and pasture to replace feed. The functional unit was 1 kg of pork slaughter weight and the system boundary was from cradle to farm gate. We used life cycle assessment, the introductory carbon balance method and human edible feed conversion efficiency to assess the performance of the pig production system. Introducing grass-clover biomass as a total mixed ration in conventional pig diets, reduced the climate impact (-17%), eutrophication (-7.1%), marine eutrophication (-15%), energy use (-13%), and feed-food competition (-20%) per kg of pork meat, while acidification (+2.7%) and land use (+1.5%) were slightly increased compared with the reference. The lower climate impact (without considering soil carbon change) was attributable to reduced fertilizer and diesel needs due to pre-crop effects. Overall, feeding grass-clover biomass decreased several environmental impact categories, feed-food competition and improved cereal-based cropping systems by the introduction of grass-clover leys.

Place, publisher, year, edition, pages
2023. Vol. 30, p. 103068-103068, article id 103068
National Category
Soil Science
Identifiers
URN: urn:nbn:se:ri:diva-64061DOI: 10.1016/j.eti.2023.103068OAI: oai:DiVA.org:ri-64061DiVA, id: diva2:1738898
Note

This study was part of the Mistra Food Futures project, Sweden (Grant number DIA 2018/24 #8), a research program financed by the Stiftelsen för miljöstrategisk forskning (MISTRA), Sweden . We would like to express our gratitude to MISTRA for the funding and to Ingela Löfquist for her help with feed formulation and crop rotation data.

Available from: 2023-02-23 Created: 2023-02-23 Last updated: 2023-05-16Bibliographically approved

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Salomon, Eva

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