Abstract
In the Pyrenees Mountains, the climatic constraints of all the seasons of the year contribute to the difficulties of wintering. The variables concerning hay stocks and cattle needs are classified according to their invariance level in time. By this means, studying the different ways of fitting hay supply and demand becomes easier. Therefore, we have, on the one hand, the more stable variables (farming system structures, strategic decisions) and, on the other, the less stable variables (tactical decisions). This classification allows us to characterise the variables and to discuss the results of the model. The aims of the model are, first, research into the reliability of technical management rules taking into account the seasonal climatic variations and, secondly, evaluation of the impact of tactical regulations, according to several assumptions about farming system structures and strategies. The variables relating to cattle are purposely simplified. Except for the climatic data, the other variables have been estimated by investigation. In this paper, we describe the conception and building of the model and show only some of the results. A complete analysis of the results will be presented later.
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