2 fig. 1 tab. 8 ref. Sum. (En)

Linear programming and the "PASTOR" programme were used as tools to model silvopastoral options for dual purpose production systems in the humid tropics. A model was developed for a representative farm of 70 ha. The land use systems modelled were: 1) natural pasture with and without living fence posts; 2) Brachiaria brizantha/Arachis pintoi mixture; 3) alley pasture (B. brizantha/Erythrina berteroana); and 4) grazing in Tectona grandis plantations. In all land use options planting T. grandis in bordelines was considered, except with infertile poorly drained soils. Milk production increased significantly (14 to 41 percent) when current milk prices were increased by 10 to 25 percent. Growing T. grandis in borderlines of natural and B. brizantha/A. pintoi pastures were the most important land use systems selected by the model to maximise net returns. Grazing of T. grandis plantations was not atractive for livestock farms except when prices of timber increased by 10 and 25 percent.