Combination of linear and weighted goal programming with penalty function in optimisation of a daily dairy cow ration
Zgajnar, J.,University of Ljubljana (Slovenia). Biotechnical Faculty | Juvancic, L.,University of Ljubljana (Slovenia). Biotechnical Faculty | Kavcic, S.,University of Ljubljana (Slovenia). Biotechnical Faculty
The aim of this paper was to present a spreadsheet tool developed for the formulation of daily rations for dairy cows. It is constructed on the basis of two linked sub-models developed on the MS Excel platform. It merges the common linear programming model and the weighted-goal programming model with a penalty function. The first sub-model is included in the tool to make an estimate of the least-cost magnitude that might be expected. The obtained result is entered into the second sub-model as the goal that should be met as closely as possible. The tool was tested at two different values of preferential weights for dairy cows with a 25 kg daily milk yield. The results obtained confirm the benefits of the applied approach. In contrast to the common linear program tools, which terminate at formulation of the least-cost ration, our tool provides more efficient rations (in both economic and nutritive terms) by fine-tuning the nutritive goals and by allowing for harmless deviations from these goals by application of penalty functions.
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