The document summarizes the changing landscape of livestock production in developing countries. It notes that demand for animal source foods is rapidly increasing in developing countries. Smallholder farms currently dominate livestock production in many developing nation contexts. There are opportunities for agricultural research, including animal genetics, to help enable a sustainable transition and meet rising demand through improving smallholder systems rather than large-scale industrialization. Achieving food security while addressing environmental and health challenges will require productivity gains from improved animal health, genetics, and feeding practices.