EGG production under 24‐, 26‐ and 28‐hour light‐dark cycles

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Abstract
An experiment is described conducted on approximately 1000 pullets over a period of 10 months. The three treatments used were cycles of 24, 26 and 28 h composed of 17 1/2 light : 6 1/2 dark, 17 1/2 light : 8 1/2 dark and 17 1/2 light : 10 1/2 dark. Egg production varied significantly (P < 0.01) among the treatments, the mean rates of lay, expressed as eggs per 100 birds per 24 h, being 76.2, 77.2 and 74.9 for the 24‐, 26‐ and 28‐h cycles respectively. The relative effects of the treatments were found to remain unaltered throughout the experiment.

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