Reducing the release of nutrients that could become pollutants, and preventing the abuse of non-renewable resources are essential components of sustainable swine production. The excretion by the pigs of certain nutrients like nitrogen (N) and numerous mineral elements depend on the intake of these nutrients, their availability and on how the nutrient supply corresponds to animal needs. This research was designed to develop a new computerized method for the formulation of the diet of growing pigs, considering simultaneously economical, environmental and zootechnical objectives. It is possible to reduce excess N and P supply through the computerized method developed with this project. Moreover, it is not always necessary to maximize animal performances in order to maximize revenue. Finally, it is possible to further reduce the P supply in the diet of growing pigs by taking into account the metabolisms of P and Ca simultaneously, since they interact within the overall metabolism. During the months studied in Québec, increasing the cost of formulations by only 1% reduced the release of P and N by 5% and more. Also, depending on the production context studied, one obtains maximum net revenue by reducing the protein consumption by an amount between 6 and 30% of the maximum needs.” However, further research is needed to improve the accuracy of our results. Diminishing the release of potentially polluting nutrients must start with a diet formulation that minimizes nutrient excess by adjusting nutrient supply to animal needs, and with the goal of optimizing revenue rather than performances.