Part 1 Background: livestock in the tropics; cattle, buffalo, goats, sheep, camels, pigs, equidae, poultry; importance and production functions; relative importance of domestic species, more than meat and milk; classifying, describing and improving production systems. Part 2 Extensive systems with low input and low output: the "swidden" system in Asia; case study - Northern Thailand; irrigated agriculture; case study - Bogor District, West Java, Indonesia; case study - duck egg production in West Java; case study - the Office du Niger, Mali; mixed smallholder farms in highland Africa; case study - Rwanda, Burundi and Zaire; mixed systems in the Latin American highlands; case study - the central American highlands; small farms in the lowland wetter tropics; case study - small farm buffalo production in Sri Lanka; case study - trypanotolerant livestock in the Gambia; Tree crop systems; case study - draught buffalo in Malaysian oil palm plantations; case study - beef under coconuts in the Solomon Islands; argo-pastoral systems in the semi-arid tropics; case study - the Baqqara transhumant system in western Sudan; case study - mixed cropping in India; case study - the sertao of Ceara State, north-east Brazil; North African mixed livestock-crop systems; case study - goats in the Nile Valley and the coastal desert, Egypt; traditional pastoral systems; case study - Masai group ranches in southern Kenya; case study - Touareg desert pastures in the Air region, Niger; case study - Karakul pelt production in Botswana; case study - the Latin American savanna system; case study - South American camelids in the High Andes; modern pastoral systems; case study - parastatal ranches in Tanzania; case study - game production; case study - co-operative wool and mohair production in Lesotho; landless and urban systems; case study - multi-species poultry in West Africa; case study - peri-urban milk production in Mauritania. Part 3 Intensive systems with high input and high output: crop-livestock-aquaculture sustainable systems; case study - integrated goat and fish farming in the Philippines; case study - sustainable intensive production in Colombia; intensive poultry development in Pakistan; case study - state pig production in Cuba. Part 4 Microlivestock systems: microlivestock systems; case study - snails; case study - cane rats and grasscutters; case study - rabbits; case study - guinea pigs. Part 5 Integrating livestock and crop systems: enhancing crop-livestock interactions; improving direct physical animal to crop contributions; raising indirect physical crop to animal contributions.