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Effect of ignoring major genes when predicting response to selection

Published online by Cambridge University Press:  24 November 2017

S.P. Simpson
S.P. Simpson*
Affiliation:
AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, Roslin, Midlothian EH25 9PS
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Extract

Selection is an important component of animal breeding theory. Directional selection is used extensively in animal breeding programmes as a method of obtaining genetic improvement. Much of the theory used to explain the consequences of selection assumes that the quantitative traits under consideration, eg. leanness or index scores, are under the control of many genes with small effects (polygenes). However, many traits are under the control of both polygenes and a major gene. Conventionally, the expected response to index selection is taken to be R=ih2σp, where σP is the phenotypic standard deviation of the index, h2 its heritability and i the intensity of selection. The intensity of selection is the expected mean of the index scores of the selected animals and has been tabulated by Falconer (1989).

Type
Animal Breeding
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1990 , March 1990 , pp. 10
Copyright
Copyright © The British Society of Animal Production 1990

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References

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