Abstract
THE success of the incubation and of the storage of eggs depends to a large extent upon egg shell quality. The stronger and thicker the shell, the less breakage that will occur on farms and in marketing channels. The specific gravity of the whole egg has been shown by Olsson (1934) to be a good measure of shell thickness. Novikoff and Gutteridge (1949), comparing the different methods of determining shell strength in eggs, concluded that the specific gravity method is the most reliable.Relatively little is known regarding the effect of the various hormones on shell thickness. Data obtained by Asmundson and Pinsky (1935), Gutteridge and Pratt (1946), Gutteridge and Novikoff (1947), Hoffmann and Wheeler (1948), Godfrey (1949), Berg and Bearse (1951), and Savage et al. (1952), showed that feeding thyroprotein to laying hens improved shell quality as measured by the specific gravity of their eggs. Hutt and Gowe (1948) …
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