Along the last ten years, the French National Agency for Research (ANR) has financed several projects regarding livestock at local and global scale. Five of these projects decided to gather their results in order to better understand the long-term livestock dynamics and the scenarios for the future. Research actions have been developed in fifteen sites in diverse biomes located in seven countries of Europe, Africa, America and Asia. Review of literature and preliminary data collected in the sites showed the high complexity of the livestock dynamics. For example, in some cases, intensification of the livestock farming systems regards land. In other cases, intensification regards labor. In other cases, breeders are adopting more extensive practices. Similar process had been noticed for the farm size which increases or decreases according to the site and the type of farms. Diverse strategies have been mentioned regarding marketing, collective actions and environment impacts. To face this complexity, the analysis has been developed site by site and project by project, before a comparative approach