Changes of beef ration composition: an example of utilizing normative and positive mathematical methods.

摘要

The aim of this paper was to present the possibility of combining different mathematical methods for analysis of ration composition changes in actual economic environment. On the basis of mathematical programming models, based on constraint optimization, the influence of price-cost ratios on the trends of efficient beef ration formulation in the period 1998 to 2008 has been analysed. For investigation positive and normative mathematical methods have been utilized. The normative part of methods applies a common linear programming approach supported by penalty function. To find out the "reaction" of rational farmers within given circumstances, the simulation was upgraded with positive mathematical programming approach. Obtained results illustrate changes in ration composition by increased maize silage quantities and significantly lower amounts of grass silage during the last decade. Due to Slovenia's natural conditions, it is obvious that such a dramatic shift is impossible. Therefore, more attention should be paid to the reduction of grass silage production costs.