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. 2013 Apr 22;8(4):e61544.
doi: 10.1371/journal.pone.0061544. Print 2013.

Genetic structure and gene flows within horses: a genealogical study at the french population scale

Pauline Pirault  1 , Sophy Danvy, Etienne Verrier, Grégoire Leroy
Affiliations

Genetic structure and gene flows within horses: a genealogical study at the french population scale

Pauline Pirault et al. PLoS One. .

Abstract

Since horse breeds constitute populations submitted to variable and multiple outcrossing events, we analyzed the genetic structure and gene flows considering horses raised in France. We used genealogical data, with a reference population of 547,620 horses born in France between 2002 and 2011, grouped according to 55 breed origins. On average, individuals had 6.3 equivalent generations known. Considering different population levels, fixation index decreased from an overall species FIT of 1.37%, to an average [Formula: see text] of -0.07% when considering the 55 origins, showing that most horse breeds constitute populations without genetic structure. We illustrate the complexity of gene flows existing among horse breeds, a few populations being closed to foreign influence, most, however, being submitted to various levels of introgression. In particular, Thoroughbred and Arab breeds are largely used as introgression sources, since those two populations explain together 26% of founder origins within the overall horse population. When compared with molecular data, breeds with a small level of coancestry also showed low genetic distance; the gene pool of the breeds was probably impacted by their reproducer exchanges.

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Conflict of interest statement

Competing Interests: The authors have declared that no competing interests exist.

Figures

Figure 1
Figure 1. Current gene flows and founder origins for the three categories Race and riding horses (blue), Pony (green) and Draught Horses (pink).
Number of individuals (2002–2011) in parenthesis.
Figure 2
Figure 2. Phenogram of relations between the 55 breed origins, based on 1 – coancestry rate.
Figure 3
Figure 3. Current gene flows and founder origins for Race and riding horses populations.
Parental gene flows under 1% are not presented here. Number of individuals (2002–2011) in parenthesis.
Figure 4
Figure 4. Relation between genealogical coancestry rates and molecular Reynold distances based on relation matrix of 32 horse breeds.
Blue cross represent breed pairs with coancestry larger than 0, red circles represent breeds pairs with coancestry equal to 0.
See this image and copyright information in PMC

References

    1. Porter V, Mason L (2002) A World Dictionary of Livestock Breeds, Types, and Varieties, 5th edition. Wallingford: CABI Publishing. 380 p.
    1. Moureaux S, Verrier E, Ricard A, Meriaux JC (1996) Genetic variability within French race and riding horse breeds from genealogical data and blood marker polymorphisms. Genet Sel Evol 28: 83–102.
    1. Cervantes I, Gutiérrez J, Molina A, Goyache F, Valera M (2009) Genealogical analyses in open populations: the case of three Arab-derived Spanish horse breeds. J Anim Breed Genet 126: 335–347. - PubMed
    1. Bartolomé E, Cervantes I, Valera M, Gutiérrez JP (2011) Influence of foreign breeds on the genetic structure of the Spanish Sport Horse population. Livest Sci 142: 70–79.
    1. Aberle K, Wrede J, Distl O (2004) Analysis of relationships between German heavy horse breeds based on pedigree information. Berl Munch Tierarztl Wochenschr 117 (1–2) 72–75. - PubMed

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