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XXI.—Sex-linked Association of Egg Weight and Body Weight in Brown Leghorns

Published online by Cambridge University Press:  11 June 2012

Robert Osborne
Robert Osborne
Affiliation:
Poultry Research Centre, Edinburgh, 9.
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Synopsis

The present report is submitted as an illustration of the utility of variance and covariance analysis in the detection of specific modes of inheritance in quantitative genetics.

The techniques are discussed with reference to the existence of sex-linkage, maternal effects, non-additivity, and the confounding of these. Comparison of variance components due to male and female parents has revealed marked evidence of sex-linked variation of egg weight in a population of Brown Leghorns, but no obviously associated variation of body weight. Subsequent analysis reveals large sex-linked covariance, and it appears that sex-linked variation of body weight is masked by non-additive effects.

Similar conclusions follow from regression analysis of offspring on parent. For egg weight there is marked dependence of offspring on paternal variation, whilst for body weight, heritability from regression analysis is substantially lower than that estimated from correlations between offspring, in accordance with the existence of sex-linked and non-additive effects.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 65 , Issue 3 , 1955 , pp. 317 - 326
Copyright
Copyright © Royal Society of Edinburgh 1955

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References

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