Abstract
ABSTRACT THE thickness and porosity of egg shells are important factors in maintaining egg quality. Shell thickness influences breaking strength and porosity influences the passage of gases and microorganisms through the shell. Almquist and Holst (1931) measured shell porosity by determining the approximate number of pores that would be penetrated by an alcoholic solution of methylene blue. They demonstrated a direct relationship between the loss in weight of eggs stored for various periods and the number of stained pores. Godfrey and Olsen (1937) incubated eggs for two weeks at 99.5°F to determine their weight loss. They were able to demonstrate both breed and individual bird differences in weight loss. Morgan (1932) determined the relationship between the breaking strength of egg shells and the shell weight. A positive correlation between the shell weight and the breaking strength was found. Munro (1940a) demonstrated a curvilinear relationship between specific gravity and hatching power. Godfrey . . .
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