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A note on selection differential and generation length when generations overlap

Published online by Cambridge University Press:  02 September 2010

J. W. James
J. W. James
Affiliation:
School of Wool and Pastoral Sciences, University of New South Wales, Kensington, New South Wales 2033, Australia
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Summary

The generation interval may be defined as the mean age of parents of all progeny born, or as the mean age of parents of only those progeny destined to be selected as replacements. If the mean age of parents of replacements is used, selection differentials must be calculated within parental age groups. If the mean age of parents of all progeny born is used, the selection differential contains a component due to disproportionate selection of replacements from different parental age groups.

Information

Type
Research Article
Information
Animal Production , Volume 24 , Issue 1 , February 1977 , pp. 109 - 112
Copyright
Copyright © British Society of Animal Science 1977

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References

REFERENCES

Bichard, M., Pease, A. H. R., Swales, P. H. and özkutuk, K. 1973. Selection in a population with overlapping generations. Anim. Prod. 17: 215–227.Google Scholar
Rendel, J. M. and Robertson, A. 1950. Estimation of genetic gain in milk yield by selection in a closed herd of dairy cattle. J. Genet. 50: 1–8.CrossRefGoogle Scholar