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Estimation of Pedigree Errors in the UK Dairy Population using Microsatellite Markers and the Impact on Selection

P. M. Visscher^*, J. A. Woolliams, D. Smith and J. L. Williams

^* University of Edinburgh, Institute of Cell, Animal and Population Biology, West Mains Road, Edinburgh EH9 3JT, UK
Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS, UK

Corresponding author:
P. M. Visscher; e-mail:
peter.visscher{at}ed.ac.uk.

The proportion of cows in the UK dairy herd whose sires were misidentified was estimated using DNA markers. Genetic marker genotypes were determined on 568 cows (from 168 milk samples and 400 hair samples) and 96 putative sires (from semen samples). The estimated pedigree error rate from the hair samples was 8.8%, and from the milk samples, 13.1%, giving an overall estimate of the error rate of 10%. This level of pedigree errors will have a relatively large impact on the efficiency of progeny testing and the accuracy of cow predicted breeding values. We predict a loss of response to selection of approximately 2 to 3% given this error rate.

Key Words: pedigree error • exclusion probability • genetic marker • microsatellite marker • dairy cattle

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