Abstract
THE sex ratio of Rhode Island Red chicks in a closed flock bred for high fecundity has always shown an excess of males at eight weeks of age (Hays, 1941, 1949). Landauer and Landauer (1931) recorded the sex of 2,329 chicks that died during the first two months after hatching and found a significant excess of males. Hutt (1949) after reviewing the literature is inclined to the belief that the mortality rate in male chicks is not always greater than in females.We have observed a wide variability in the sex ratio in families of pedigreed chicks at eight weeks of age. Naturally the question arises as to whether or not these variations are associated with viability as measured by mortality rate within the family.DATA AVAILABLEThere was a total of 343 families of chicks hatched from 1938 to 1947 in a closed flock of Rhode Island Reds bred .
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