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Genetic Variation in the Crow of Adult Chickens

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Two experiments were conducted to develop reliable criteria for measuring the crows of cocks and to determine if these aspects of crows were heritable. The duration of crowing was found to be a highly repeatable characteristic inherited in a quantitative manner. Significant differences were found between breeds for the duration of crows with the ranks of stocks being the same in each experiment. Variation was greatest between breeds, followed by that among males and was least within males. Sonograms of crows demonstrated that the various components of a crow were similar among crows from single individuals but varied widely among individuals.

Affiliations: 1: Virginia Agricultural Experiment Station, Virginia Polytechnic Institute, Blacksburg, Virginia, USA


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