This document constitutes the main report of the study on the social, economic and environmental impacts, the main drivers of change and the long-term prospects of mobile livestock systems in West Africa. The study was carried out between June 2020 and January 2021 as part of the implementation of the Integrated and Secure Livestock and Pastoralism Project in West Africa (PEPISAO). This regional initiative is funded by the French Development Agency and implemented by the Economic Community of West African States.