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Accuracy of conversion of sire evaluations to united kingdom (uk) predicted transmitting ability (pta) equivalents (holstein friesian)

Published online by Cambridge University Press:  20 November 2017

M.S. Winters
Affiliation:
Animal Data Centre Ltd, Lavrock Lane, Scots Hill, Rickmansworth, Herts WD3 3AW
G.J.T. Swanson
Affiliation:
Animal Data Centre Ltd, Lavrock Lane, Scots Hill, Rickmansworth, Herts WD3 3AW
R.A. Mrode
Affiliation:
Animal Data Centre Ltd, Lavrock Lane, Scots Hill, Rickmansworth, Herts WD3 3AW
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Extract

The International Dairy Cattle breeding industry characterises itself by ever increasing competition between countries. Frozen semen and embryos are easily transportable, providing breeders with access to bulls from almost anywhere in the world. Problems arise from the fact that each country produces genetic evaluations with different units, different expressions of genetic merit and different genetic bases. Without some means of standardisation it is very difficult to make the correct selection decisions.

Procedures have been recommended and described by the International Bull Evaluation Service (INTERBULL) to convert foreign genetic evaluations to the genetic equivalents in the importing country (Philipsson et al. 1986). Previous research carried out in the UK has shown that converting foreign proofs to Improved Contemporary Comparisons (ICCs) worked well for Canada and New Zealand (Swanson et al, 1989). The change in the evaluation systems in the UK and elsewhere, to an Individual Animal Model, plus the availability of more data from more countries, were reasons to re-look at the accuracy with which the current conversion method predicts the actual PTA for milk, fat and protein within the UK.

Type
Genetics & Cattle Improvement
Copyright
Copyright © The British Society of Animal Science 1995

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References

Philipsson, J., Danell, B., Schaeffer, L.R., Schneeberger, M., Schulte-Coerne, H., and Wilmink, J.B.M. (1986) Procedures for international comparisons of dairy sires - current practice and evaluation of methods. International Bull Evaluation Service. Bulletin No. 1.Google Scholar
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Schaeffer, L.R. and Zhang, W. (1993) Multi-trait across country evaluation of dairy sires. International Bull Evaluation Service. Bulletin No. 8.Google Scholar
Swanson, G.J.T., Bellamy, H.J. and Oliver, G. (1988) A comparison of methods to convert foreign progeny test evaluations to approximate United Kingdom Improved Contemporary Comparison Equivalents (FriesianlHolstein). Proc. Br. Soc. Anim. Prodn. Winter Meeting. Paper 112.Google Scholar