Genetic diversity among horse populations with a special focus on the Franches-Montagnes breed

Glowatzki-Mullis, M L; Muntwyler, J; Pfister, W; Marti, E; Rieder, S; Poncet, P A; Gaillard, C (2006). Genetic diversity among horse populations with a special focus on the Franches-Montagnes breed. Animal genetics, 37(1), pp. 33-9. Oxford: Blackwell 10.1111/j.1365-2052.2005.01376.x

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Genetic characterization helps to assure breed integrity and to assign individuals to defined populations. The objective of this study was to characterize genetic diversity in six horse breeds and to analyse the population structure of the Franches-Montagnes breed, especially with regard to the degree of introgression with Warmblood. A total of 402 alleles from 50 microsatellite loci were used. The average number of alleles per locus was significantly lower in Thoroughbreds and Arabians. Average heterozygosities between breeds ranged from 0.61 to 0.72. The overall average of the coefficient of gene differentiation because of breed differences was 0.100, with a range of 0.036-0.263. No significant correlation was found between this parameter and the number of alleles per locus. An increase in the number of homozygous loci with increasing inbreeding could not be shown for the Franches-Montagnes horses. The proportion of shared alleles, combined with the neighbour-joining method, defined clusters for Icelandic Horse, Comtois, Arabians and Franches-Montagnes. A more disparate clustering could be seen for European Warmbloods and Thoroughbreds, presumably from frequent grading-up of Warmbloods with Thoroughbreds. Grading-up effects were also observed when Bayesian and Monte Carlo resampling approaches were used for individual assignment to a given population. Individual breed assignments to defined reference populations will be very difficult when introgression has occurred. The Bayesian approach within the Franches-Montagnes breed differentiated individuals with varied proportions of Warmblood.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DKV - Clinical Immunology (discontinued)
05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DVK - Clinical Research (discontinued)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Experimental Clinical Research
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics

UniBE Contributor:

Glowatzki, Marie-Louise; Marti, Eliane Isabelle and Gaillard, Claude

ISSN:

0268-9146

Publisher:

Blackwell

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:45

Last Modified:

03 Feb 2015 08:30

Publisher DOI:

10.1111/j.1365-2052.2005.01376.x

PubMed ID:

16441293

Web of Science ID:

000234917300005

URI:

https://boris.unibe.ch/id/eprint/18485 (FactScience: 630)

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