The selection of animals for improved production traits has long been the major driver of pig breeding. More recently, new selection criteria are being explored, such as nitrogen (N) excretion. However, life cycle assessment (LCA) provides much better indicators of environmental impacts. The objective of this study was to investigate, using a modelling approach, relationships between production traits and LCA impacts of individual growing pigs. Impacts were calculated at the farm gate using the functional unit of one kg of body weight gain. Performances of pigs were simulated for two feeding programs − 2-phase and precision feeding − using the InraPorc population model (1,000 pigs per scenario). LCA calculations were performed for each pig according to its own performance and excretion. Results indicated that N excretion was positively correlated with feed conversion ratio (FCR; r=0.956), climate change (CC; r=0.955), acidification potential (AP; r=0.968), and eutrophication potential (EP; r=0.967), regardless of the feeding program. However, FCR appeared the best indicator of LCA impacts (better than N or P excretion), with a high positive correlation (r>0.99) with CC, AC, and EU for both feeding programs. Despite the lower CC, AP, and EP in the precision-feeding program (3%, 16% and 11% lower, respectively, than those for the 2-phase program), the correlations between performance and impacts were similar, although the ranking of pigs differed slightly. Thus, using of FCR as a selection criterion in pig breeding appears a promising approach to associate higher performance with lower environmental impact.