Egg-shell cracking is a serious economic liability in the poultry industry in Sweden; its cost has been estimated at about 20 million Sw. Crowns per year. The percentage of cracked eggs increases with the production period. If the' prodution period is to be prolonged, it will be necessary to develop a method for improving shell quality.

There are several ways to measure shell quality. The most common measures are; specific gravity, shell deformation, shell thickness, and breaking strength.
However, estimates of the correlation between these indirect measures of shell quality and the frequency of cracked eggs are few. Estimates of heritability for shell quality, as measured by frequency of cracked eggs, and genetic correlations between this trait and productivity traits are seldom found in the literature.

G. Engstrom

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 875-880, 1982
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