Abstract
THE apparent increase in hatchability of turkey eggs when submitted to a pre-incubation period of warming as reported by Kosin (1956) and of chicken eggs as shown by Jackson (1912) and Becker and Bearse (1958) raises the question as to whether there is a genetic effect on this response. If such an effect exists, it may be a clue as to why certain sire families exhibit higher hatchability than do other families. This study was designed so as to determine if there are sire family differences in the response to pre-incubation warming.PROCEDUREThe stock used in this study was the trapnested Station flock of Broad Breasted Bronze turkeys. In 1958 there were 136 females started in 11 single male mating pens, and in 1959 there were 110 females started in 10 single male mating pens. The eggs were all marked in the usual manner with the hen number, pen …
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