This study is included in a broader PhD project of the National University of Colombia on socio-economic sustainability of countryside areas in Colombia. Especially the study focused important aspects for development of the Department of the Valle del Cauca. The general study focuses cattle farms and land use, their relationships with rural development (socio-economic aspects) and with environmental impacts (effects on water and ecological footprint). This paper will firstly show the casual loop diagram of the general project and then will focus the presentation of the developed stock and flow diagram of animal categories and biomass availability from land. In particular in this work a submodel of the stoking rate of raised cattle in a given farm was developed and presented. The model was able to describe the equilibrium of the herd consistency when constant precipitations lead to constant biomass production from the owned land. Drops in rainfall were also simulated and the model was used to investigate the most convenient farm strategy of animal selling in order to adjust the stocking rate of the farm to the stocking rate capacity of the land.
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