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Synopsis
The egg shape index and shell deformation of 2466 pullet and 2214 hen eggs have been studied each week over a period of 45 weeks. The weekly and 5‐week averages were utilised for correlation analysis.
A pronounced negative correlation between shape index and shell deformation variations was found for both pullet and hen eggs. The pullet egg correlation coefficient, determined on the basis of the weekly and 5‐week averages, was ‐0.605 and ‐0.885, respectively; while the corresponding values for hen eggs were ‐0.433 and ‐0.510.
It has been pointed out that although a correlated variation of shape index and shell deformation with time might be due to specific conditions, it is reasonable to assume that if the time‐dependent changes of the relevant properties were taken into account in the investigations, an improved correlation might be expected.