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Volume 60, issue 2
Arch. Anim. Breed., 60, 153–160, 2017
https://doi.org/10.5194/aab-60-153-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 60, 153–160, 2017
https://doi.org/10.5194/aab-60-153-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Original study 13 Jun 2017

Original study | 13 Jun 2017

Genetic diversity in Tunisian horse breeds

Bayrem Jemmali1, Mohamed Mezir Haddad2, Nawel Barhoumi1, Syrine Tounsi1, Faten Lasfer2, Amira Trabelsi3, Belgacem Ben Aoun2, Imen Gritli3, Soufiene Ezzar2, Abdelhak Ben Younes3, Mohamed Habib Ezzaouia2, Boulbaba Rekik1, and Hatem Ouled Ahmed3 Bayrem Jemmali et al.
  • 1Laboratoire d'Amélioration et de Développement Intégré de la Productivité Animale et des Ressources Alimentaires, Ecole Supérieure d'Agriculture de Mateur, Université de Carthage, Carthage, Tunisia
  • 2Fondation Nationale d'Amélioration de la Race Chevaline, Sidi Thabet, Tunisia
  • 3Laboratoire d'Analyse Génétique Animale, Institut de la Recherche Vétérinaire de Tunisie, Tunis, Tunisia

Abstract. This study aimed at screening genetic diversity and differentiation in four horse breeds raised in Tunisia, the Barb, Arab-Barb, Arabian, and English Thoroughbred breeds. A total of 200 blood samples (50 for each breed) were collected from the jugular veins of animals, and genomic DNA was extracted. The analysis of the genetic structure was carried out using a panel of 16 microsatellite loci. Results showed that all studied microsatellite markers were highly polymorphic in all breeds. Overall, a total of 147 alleles were detected using the 16 microsatellite loci. The average number of alleles per locus was 7.52 (0.49), 7.35 (0.54), 6.3 (0.44), and 6 (0.38) for the Arab-Barb, Barb, Arabian, and English Thoroughbred breeds, respectively. The observed heterozygosities ranged from 0.63 (0.03) in the English Thoroughbred to 0.72 in the Arab-Barb breeds, whereas the expected heterozygosities were between 0.68 (0.02) in the English Thoroughbred and 0.73 in the Barb breeds. All FST values calculated by pairwise breed combinations were significantly different from zero (p  <  0.05) and an important genetic differentiation among breeds was revealed. Genetic distances, the factorial correspondence, and principal coordinate analyses showed that the important amount of genetic variation was within population. These results may facilitate conservation programs for the studied breeds and enhance preserve their genetic diversity.

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This study aimed at screening genetic diversity and differentiation in four horse breeds raised in Tunisia: the Barb (BA), Arab-Barb (AB), Arabian (AR), and English Thoroughbred (TS) breeds. A total of 200 blood samples were collected and genomic DNA was extracted. The average number of alleles per locus was 7.52 (0.49), 7.35 (0.54), 6.3 (0.44), and 6 (0.38) for the AB, BA, AR, and TS, respectively. Results showed that the important amount of genetic variation was within population.
This study aimed at screening genetic diversity and differentiation in four horse breeds raised...
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