This handbook, developed for training Peace Corps volunteers, reviews the basic principles that underlie sound grazing land management and indicates the application of these principles for livestock production in the tropics and subtropics. The handbook is made up of three technical series bulletins. The first bulletin covers management of rangelands and other grazing lands of the tropics and subtropics for support of livestock production. Topics included in this section are land use and livestock, the natural resources base of permanent grasslands, coping with restraints affecting forage production, the elements of productive grassland management, measuring productivity of rangelands and other permanent grasslands, and estimating feed requirements of ruminant livestock in tropical and subtropical regions. The second bulletin explains how to grow "Leucaena leucocephala," a plant that can be used for livestock feed, among a multitude of other uses. The final bulletin discusses combined crop/livestock farming systems for developing countries of the tropics and subtropics and offers suggestions for improving the profitability of such systems. Materials in the handbook are illustrated with line drawings and photographs. (KC)