Abstract
1. In two strains of Barred Plymouth Rock and one strain of Rhode Island Red birds a highly significant effect of strain was found on the size of eye cups and pupils in 6‐d‐old chick embryos. The average values of these eye characteristics and their variations were also influenced by the composition and energy content of the diet fed to the dams. 2. A strong positive phenotypical relationship was found between the size of eye cups and pupils, especially between the size of the left and the right eye cups. No relationship was found between the eye characteristics and the weight of egg. 3. An asymmetry of the left and the right eye was recorded; the left eye cups and pupils were smaller than the right on average by 2.2 and 3.9%, respectively.
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