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The egg shell strength of lines selected for egg mass was evaluated at two ages by deformation, breaking strength, specific gravity, and percentage shell. Highly significant differences were detected in shell strength between lines. These differences were consistent for the different methods of evaluating shell strength and for the different ages. The differences in shell strength between lines were not associated with differences in egg mass, percent egg production, egg weight, or egg shape.
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Washburn et al. (1981) studied this question.
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