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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 1996;9(6): 723-726.
https://doi.org/10.5713/ajas.1996.723    Published online December 1, 1996.
The development of the water loaded pressure method for measuring eggshell quality
C. W. Kang, K. T. Nam, O. E. Olson, C. W. Carlson
A water loaded pressure divice using water as the breaking force was developed to evaluate eggshell strength and compared with a dropping ball techniques. Further, relationships of shell thickness and weight of eggs to shell strength were also studied. Values for both of the shell strength measuring methods showed a highly significant correlation(p<0.001) with shell thickness. The water loaded pressure method had a much higher simple correlation coefficient for shell thickness(r = + 0.786) than the dropping ball method(r = + 0.577). The shell strength measured by the water loaded pressure method appeared not to be correlated to egg witght. On the other hand, the negative sign of the standard partial regression coefficient and the partial regression coefficient of egg weight in the estimated multiple regression equation implied that for a given shell thickness a larger egg tended to have less shell strength than a smaller egg.
Keywords: Eggshell Thickness; Water Loaded Pressure; Eggshell Quality

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