In the recent years, the reproductive performance of sows has been drastically improved. Nowadays, in many farms, with the use of hyperprolific sows, the average litter size exceeds 14 piglets at farrowing and 12 at weaning. These changes in performance have been the major drivers for the evolution of sow's nutritional requirements during pregnancy and lactation. At the same time, a large amount of scientific knowledge has been produced over the last twenty years allowing, with the use of mathematical modelling, a holistic approach of energy, amino acids and minerals supplies to sows. The aim of the present presentation is to describe how the current state of knowledge on sow nutrition can be included in an integrated model, as well as in a software tool, designed for end-users, mainly nutritionists in the pig industry and students in animal nutrition. Different examples are also shown to illustrate how the use of such a model can help in optimizing the productivity of sows, whilst considering new priorities such as the reduction of the environmental impact of pig production which can be achieved through a more precise adjustment of nutrient supply to requirement, with the perspective of precision feeding.