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Integration of genomic information into sport horse breeding programs for optimization of accuracy of selection

Published online by Cambridge University Press:  21 March 2012

A. M. Haberland ,
U. König von Borstel ,
H. Simianer  and
S. König
A. M. Haberland*
Affiliation:
Department of Animal Sciences, University of Goettingen, 37075 Goettingen, Germany
U. König von Borstel
Affiliation:
Department of Animal Sciences, University of Goettingen, 37075 Goettingen, Germany
H. Simianer
Affiliation:
Department of Animal Sciences, University of Goettingen, 37075 Goettingen, Germany
S. König
Affiliation:
Department of Animal Breeding, University of Kassel, Nordbahnhofstraße 1a, 37213 Witzenhausen, Germany
*
†E-mail: ahaberl@gwdg.de
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Abstract

Reliable selection criteria are required for young riding horses to increase genetic gain by increasing accuracy of selection and decreasing generation intervals. In this study, selection strategies incorporating genomic breeding values (GEBVs) were evaluated. Relevant stages of selection in sport horse breeding programs were analyzed by applying selection index theory. Results in terms of accuracies of indices (rTI) and relative selection response indicated that information on single nucleotide polymorphism (SNP) genotypes considerably increases the accuracy of breeding values estimated for young horses without own or progeny performance. In a first scenario, the correlation between the breeding value estimated from the SNP genotype and the true breeding value (= accuracy of GEBV) was fixed to a relatively low value of rmg = 0.5. For a low heritability trait (h2 = 0.15), and an index for a young horse based only on information from both parents, additional genomic information doubles rTI from 0.27 to 0.54. Including the conventional information source ‘own performance’ into the before mentioned index, additional SNP information increases rTI by 40%. Thus, particularly with regard to traits of low heritability, genomic information can provide a tool for well-founded selection decisions early in life. In a further approach, different sources of breeding values (e.g. GEBV and estimated breeding values (EBVs) from different countries) were combined into an overall index when altering accuracies of EBVs and correlations between traits. In summary, we showed that genomic selection strategies have the potential to contribute to a substantial reduction in generation intervals in horse breeding programs.

Keywords

accuracy of selectionbreeding strategiesgeneration intervalgenomic selectionsport horse
Type
Full Paper
Information
animal , Volume 6 , Issue 9 , September 2012 , pp. 1369 - 1376
Copyright
Copyright © The Animal Consortium 2012

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