Rebound effects of eco-design of animal feed Feed manufacturers now have access to eco-labelling databases which allow them to perform eco-design and produce feeds with reduced environmental impacts. Initial results of eco-feed production emphasise replacing feed ingredients in standard feed. Therefore, the objective of this study was to identify rebound effects of producing eco-feed for pigs if replacing feed ingredients becomes widespread in France. A mind map was built with five experts to identify in a qualitative a panel of different consequences on environmental, economic and social aspects. We then focused on the consequence of changing crop rotations to produce eco-feeds. We used life cycle assessment (LCA) on a virtual territory which produced feed ingredients for a pig farm in order to assess environmental impacts using multiple functional units and system perimeters: kg pig live weight at the farm gate, ha of land used, economic value produced and number of people fed. The situation in which eco-feeds are produced can appear better or worse than the situation in which standard feeds are produced. This study highlights the complexity of eco-design and the limitations of doing it with data based on attributional LCA (i.e. cutting a system off from physical and economic causalities of the rest of the world). It is necessary to supplement databases with information to make users aware of rebound effects that are invisible during the eco-design process.