Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-30T19:01:53.189Z Has data issue: false hasContentIssue false

Selection of extremes

Published online by Cambridge University Press:  02 September 2010

Hans Abplanalp
Affiliation:
Department of Avian Sciences, University of California, Davis, California 95616, USA
Get access

Summary

A method of selection for two or more traits is investigated, where the selected individuals have to be the highest performing for any one trait, but not necessarily for several traits. The efficiency of selection of extremes is contrasted with the methods of culling levels and tandem selection. It is shown to be superior to culling level selection when the proportion of individuals retained for breeding exceeds 0·5. At higher selection intensities, the effectiveness of selection of extremes falls between that of culling levels and tandem selection.

Type
Research Article
Copyright
Copyright © British Society of Animal Science 1972

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Hazel, L. N. and Lush, J. L. 1942. The efficiency of three methods of selection. J. Hered. 33: 393399.CrossRefGoogle Scholar
Pearson, K. 1931. Tables for Statisticians and Biometricians. Part II. Cambridge Univ. Press.Google Scholar
Weiler, H. 1959. Means and standard deviations of a truncated normal bivariate distribution. Aust. J. Stat. 1: 7381.CrossRefGoogle Scholar
Williams, J. M. and Weiler, H. 1964. Further charts for the means of truncated normal bivariate distributions. Aust. J. Stat. 6: 117129.CrossRefGoogle Scholar
Young, S. S. Y. 1961. A further examination of the relative efficiency of three methods of selection for genetic gains under less-restricted conditions. Genet. Res. 2: 106121.CrossRefGoogle Scholar
Young, S. S. Y. 1964. Multi-stage selection for genetic gain. Heredity, Lond. 19: 131145.CrossRefGoogle Scholar
Young, S. S. Y. and Weiler, H. 1960. Selection for two correlated traits by independent culling levels. J. Genet. 57: 329338.CrossRefGoogle Scholar