Abstract
A structured multi-period Goal Programming model for the determination of the optimal age structure of a flock of sheep given a set of sheep breeder goals is used to evaluate three sheep breeding flock cases in Egypt. The cases are: flocks with a fixed size over an arbitrary period of 5 years, flocks with a growing size over the same period and flocks with a fixed size and stable age structure over time. The breeder's goals considered are the total increase of kilograms weaned and the total wool produced by the flock, the decrease of the average flock age and the flock initial purchase cost. The model was applied on the local Rahmany Egyptian sheep. Results for the three considered cases are presented and discussed.
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