Abstract
Abnormal sex ratios at hatching have been studied with regard to possible inherited factors by Jull (1932), Thornton (1944), and Hazel and Lamoreaux (1946). None of these workers found evidence that the tendency to produce abnormal sex ratios is inherited. Hays (1949 Hays (1950) presented data to indicate that female chicks are more likely to die than male chicks during early embryological development. Ebbell (1949) noted a great excess of male chicks at hatching in the Legbar breed. This tendency was also observed in Leghorns.In recent years a significant excess of males have appeared in the Station flock of Rhode Island Reds that have been bred as a closed flock for high fecundity without close inbreeding.In the spring of 1952, 423 chicks hatched on March 2 were killed and sex determined by an examination of the gonads. A second group hatched April 20 consisting of 370 chicks was also .
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