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Optimum selection procedures in animal breeding

Published online by Cambridge University Press:  02 September 2010

Charles Smith
Charles Smith
Affiliation:
A.R.C. Animal Breeding Research Organisation, West Mains Road, Edinburgh EH9 3JQ
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Summary

A simple expression relating the standardized selection differential (i) to the intensity of selection (p) is given by

i≏0·8+0·41 ln (R−1)

where R equals 1/p. This linear expression may allow simpler solutions to some optimization problems in selection than does the conventional formula for selection differential on truncation of the normal curve.

Using the expression, formulae for the maximum immediate response and optimum selection intensity in mass selection have been developed, taking account of the loss in performance through inbreeding. These formulae were used to study the effect on response of the total number of animals tested. The maximum response over a specified period of time, allowing for the loss in genetic variance from inbreeding, has also been considered. The optimum intensity of selection may then be well below that necessary for the maximum immediate response.

Type
Research Article
Information
Animal Production , Volume 11 , Issue 4 , November 1969 , pp. 433 - 442
Copyright
Copyright © British Society of Animal Science 1969

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References

REFERENCES

Lush, J. L. 1945. Animal Breeding Plans. Iowa State University Press, Ames, Ia.Google Scholar
Robertson, Alan. 1960a. On optimum family size in selection programmes. Biometrics 16: 296–298.Google Scholar
Robertson, Alan. 1960b. A theory of limits in artificial selection. Proc. R. Soc. B. 153: 234–249.Google Scholar