Additional keywords: pig farming, farming systems, farm management, farmers ’ cooperatives.

The authors acknowledge the staff of the pork board Midiporc and the farmers ’ cooperatives, the technical institute for swine ITP, and the departmental agricultural chambers for their participation and support, and the students of the Ecole Supérieure d’Agriculture in Angers and in Toulouse for conducting the structured questionnaires. We also acknowledge the swine farmers whom we visited, who voluntarily participated in the interviews and questionnaires. Dynamics of farming styles and cooperative actions disputes Version EAAP 2007 Rural Sociology- 2-Dynamics of farming styles and cooperative actions disputes of swine farmers in Midi Pyrenees In Southern France, the regression of swine farms and swine is ongoing. As a counteract farmers search for options of diversification of pork products. The choice for adapting the farm management to new diversified products (or not) is studied by its contribution to diversification of swine farming styles and production methods. In addition, it will involve reorientation of socio-professional networks, especially the farmers ’ cooperatives. Fo