Abstract
Previous work has shown age at sexual maturity to be determined cumulatively by a sex-linked gene, E[image], and an autosomal gene, E''. E was eliminated from hybrids of Barred Plymouth Rocks and Rhode Island Reds by marking the sex chromosome. Then the isolated E[image] was found to be responsible for decreasing age at maturity from 250 days or over to 190-200 days. When E was added, the age was further decreased to 170-175 days.

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