Purpose. Animal feeding has a major contribution to the environmental impacts (EI) of pig production. Including EI of feed ingredients into the feed formulation problem has been proposed as a way to reduce EI of pig production. The objective of this study was to test the ability of innovative formulation methodologies in growing pigs to reduce EI of pig production, while taking into account their possible effects on growth performance. Methods. We compared three different formulation methodologies: least-cost formulation (control diet) in accordance with usual practices in commercial farms; multiobjective (MO) formulation (ecodiet) considering feed cost and EI calculated by Life Cycle Assessment (LCA); MO formulation using feed ingredients locally produced by farmers (local diet) to reduce the impact of feed transport. Ninety-six pigs were distributed between the three experimental groups with pigs individually weighted and fed using an automatic feeding system. Five categories of impacts were evaluated: ILCD climate change (CC), ILCD acidification (AC), CML 2001 eutrophication (EU), CML 2001 land occupation (LO) and CED V1.8 non-renewable and fossil energy demand (CED), at both feed plant gate and at farm gate, with the one kilogram of feed and the one kilogram of live pig as functional units. Results and discussion. At feed level, MO formulation reduced CC, CED, and AC impacts but increased LO and sometimes EU impacts. These formulations reduced proportion of cereals and oil meals into feeds (feed ingredients with high impacts) while proportions of alternative protein sources, like peas, faba beans or high-protein agricultural co-products increased (feed ingredients with low impacts). Since animal performance was not affected by the dietary treatment, results obtained at farm gate with MO formulation with either standard or local feed ingredients were similar to those obtained at feed level. Conclusions. Diet formulation is a way to reduce the EI of pig production. Indeed, selecting feed ingredients with lower EI like locally produced proteins or high-protein agricultural co-products seems to be an efficient way to reduce impacts of pig production without consequences on animal performance.