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On selection among groups with heterogeneous variance

Published online by Cambridge University Press:  02 September 2010

W. G. Hill
W. G. Hill
Affiliation:
Institute of Animal Genetics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JN
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Abstract

Problems of making selection decisions among animals from several environmental groups with heterogeneous variance are discussed. Unless correction for heterogeneity of variance is made, animals will tend to be selected from the more variable groups, especially if selection is intense. This is an accurate and fair procedure only when the heterogeneity reflects real differences in heritability. It is shown that, if observations are expressed as deviations relative to the estimate of standard deviation from the group, the accuracy is high unless groups are very small.

Information

Type
Research Article
Information
Animal Production , Volume 39 , Issue 3 , December 1984 , pp. 473 - 477
Copyright
Copyright © British Society of Animal Science 1984

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References

REFERENCES

Haldane, J. B. S. 1930. A mathematical theory of natural and artificial selection. Part III. Selection intensity as a function of a mortality rate. Proc. Camb. phil. Soc. biol. Sci. 27: 131–136.CrossRefGoogle Scholar
Hill, W. G., Edwards, M. R., Ahmed, M.-K. A. and Thompson, R. 1983. Heritability of milk yield and composition at different levels and variability of production. Anim. Prod. 36: 59–68.Google Scholar
Powell, R. L., Norman, H. D. and Weinland, B. T. 1983. Cow evaluation at different milk yields of herds. J. Dairy Sci. 66: 148–154.Google Scholar
Rook, A. J. 1982. The effects of different environmental correction methods on genetic parameter estimates of traits in on-farm, individually-fed, pig performance tests. Ph.D. Thesis, Wye College, Univ. London.Google Scholar
Sarhan, A. E. and Greenberg, B. G. 1962. Contributions to Order Statistics. Wiley, New York.Google Scholar
Turner, H. N. and Young, S. S. Y. 1969. Quantitative Genetics in Sheep Breeding, p. 158. Macmillan of Australia, Melbourne.Google Scholar