Skip to main content Accessibility help
×
Home

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

  • R. E. Crump (a1), N. R. Wray (a1) (a2), R. Thompson (a1) and G. Simm (a1)

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.

Copyright

References

Hide All
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: 199207.
Schmitz, F., Everett, R. W. and Quaas, R. L. 1991. Herdyear-season clustering. Journal of Dairy Science 74: 629636.
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. 231243.

Keywords

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

  • R. E. Crump (a1), N. R. Wray (a1) (a2), R. Thompson (a1) and G. Simm (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed