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Assigning pedigree beef performance records to contemporary groups taking account of within-herd calving patterns

Published online by Cambridge University Press:  02 September 2010

R. E. Crump ,
N. R. Wray ,
R. Thompson  and
G. Simm
R. E. Crump
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
N. R. Wray
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS
R. Thompson
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
G. Simm
Affiliation:
Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
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Abstract

A method is described for assigning beef cattle performance records to within-herd management effects (contemporary groups) retrospectively, using information on the recording date and herd. This method takes account of the within-herd calving pattern. The objective of developing a method of assigning records to contemporary groups was to maximize the contemporary group size while ensuring as far as possible that records in any contemporary group were subject to the same management.

A simple method for assessing the effectiveness of different strategies for assigning records to contemporary groups is proposed, based on investigating the balance between the effects of contemporary group size upon the heritability and the accuracy of mass selection.

The results of a study of different contemporary grouping strategies in the Simmental breed are reported.

Keywords

beef cattlecalving patterncontemporary comparisons
Type
Research Article
Information
Animal Science , Volume 65 , Issue 2 , October 1997 , pp. 193 - 198
Copyright
Copyright © British Society of Animal Science 1997

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References

Crump, R. E., Simm, G., Nicholson, D., Findlay, R. H., Bryan, J. G. E. and Thompson, R. 1997. Results of multivariate individual animal model genetic evaluations of British pedigree beef cattle. Animal Science 65: 199–207.CrossRefGoogle Scholar
Schmitz, F., Everett, R. W. and Quaas, R. L. 1991. Herdyear-season clustering. Journal of Dairy Science 74: 629–636.CrossRefGoogle Scholar
Simm, G., Steane, D. E. and Wray, N. R. 1990. Developments in beef cattle breeding programmes in Europe. Proceedings of the fourth world congress on genetics applied to livestock production, Edinburgh, vol. XV, pp. 231–243.Google Scholar