To devise an organic breeding strategy it is necessary to investigate genotype by environment (GxE) interactions in
conventional and organic production systems. Therefore this study investigated these GxE interactions for fattening pig traits in organic and conventional pig production environments. The results indicate weak GxE interactions
for both growth rate and carcass leanness in organic and conventional pig production environments. With regard to
these traits, an organic breeding index within a conventional breeding program is a better option than a separate organic breeding program. However, further research on GxE interactions for other traits prized in organic production is needed.

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