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The project proposes to develop a model, combining a pig fattening unit and one (or more) cropping system(s), able to predict the effects of feeding strategies, feed formulas, crop rotations, and the levels and methods of N, P fertilization on the technical, economic and environmental performance of the farm. For instance, the model will be able to simultaneously optimize crop rotation, fertilization and feed formulation. This model will be associated with a multi-objective optimization procedure in order to study the best economy-environment trade-offs and to activate the levers of complementarity between the two units to improve the overall agro-ecological performance of the entire system.