Abstract
A simulation study of a selection scheme for the Segureña sheep breed was carried out during 21 consecutive lambings. The objective was to assess selection criteria for use in improving meat production. Two traits were considered: litter size and weaning weight. Results suggest that the best criterion for Segureña's traditional market, is the predicted breeding value of litter size. If breeders become interested in markets accepting heavier carcasses, an index-based selection, combining predicted breeding values of both litter size and weaning weight, could be a satisfactory choice. However, in future such selection could be confined to predicted breeding values of weaning weight alone, in order to avoid the negative effect of a possible change in genetic correlation between the two considered traits.
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