Mathematical programming provides a very useful method of analysis for assessing the profitability of new grazing systems and pasture species. A large number of production options can be described, in addition to the resources constraints confronting farmers. This capacity enables the whole farming system to be represented, including the interrelatedness of production enterprises, such as rotational influences on crop and pasture production and input levels. For these reasons mathematical programming models were applied to the economic analysis of SGSL data.