Providing the first evidenced-based global estimates of the many scientific, economic, policy, and capacity development impacts of livestock research in and for developing countries. This volume is an indispensable guide and reference for veterinarians, animal and forage scientists, and anyone working for the equitable and sustainable development of the world's poorer agricultural economies. Livestock is one the fastest growing agricultural sectors, with most growth occurring in developing countries. For more than four and a half decades one global centre has been mandated to conduct research on leveraging the benefits and mitigating the costs of livestock production in poor countries. This book focuses on the achievements and impacts of the International Livestock Research Institute (ILRI) and its predecessors, the International Livestock Centre for Africa (ILCA) and the International Laboratory for Research on Animal Diseases (ILRAD). The scientific and economic impacts of tropical livestock research detailed in this work reveal valuable lessons for reducing world hunger, poverty and environmental degradation. Describing the impacts of smallholder livestock systems on the global environment, the book also covers animal genetics, production, health and disease control, and livestock-related land management, public policy, and economics, all with useful pointers for future livestock-for-development research.