Genetic diversity and inbreeding in the Greek Skyros horse

Avdi, M.; Banos, Georgios

doi:10.1016/j.livsci.2007.11.007

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…Based on the comparison of our results with inbreeding estimated for other horse breeds in the world, it can be stated that genetic diversity of both breeds in Poland is rather moderate. For example, mean inbreeding estimated for the Spanish Arab Horse was 7 % (Cervantes et al, 2008), which corresponds to our result for Polish primitive horse, whereas inbreeding reported for Greek Skyros and Lipizzan horses (Avdi and Banos, 2008;Curik et al, 2003) was higher (11 and 10.3 %, respectively) than observed in our study for Polish primitive horse and Hucul breeds. Interestingly, recent study by Pinheiro et al (2013) regarding genetic diversity of the Sorraia breed (which can be considered as an Iberian analogue of the Polish primitive horse) showed an extremely high values (26.99 %) of mean inbreeding.…”

Section: Resultssupporting

confidence: 86%

Genetic diversity in Hucul and Polish primitive horse breeds

et al. 2015

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Abstract. Pedigree and molecular data were used to evaluate genetic diversity in the Polish populations of the Polish primitive horse (also known as Polish Konik) and Hucul breeds over the time period of 30 years . Based on genotypes in 12 microsatellite loci (for 3865 Polish primitive horses and 1627 Huculs), as well as on pedigree data derived from over 7000 individuals (both breeds), several indices describing structure of the analysed populations were estimated. For both analysed breeds, we observed an increasing trend of inbreeding since 1980 which seems to be much more stable (oscillating around 10 % in the Polish primitive horse and 5 % in Hucul) since the beginning of 2000s when they were included in conservation programs in Poland. We observed that generally, indices related to genetic diversity are higher in the Hucul breed. Our study indicated that genetic diversity in the Polish primitive horse and Hucul breeds in Poland is still relatively high and conservation programs should be continued to keep it on the "safe" level in the future.

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Section: Resultssupporting

confidence: 86%

Genetic diversity in Hucul and Polish primitive horse breeds

et al. 2015

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“…H O averaged 0.637 (ranging from 0.426 for LEX05 to 0.768 for UMO11) while H E had a mean of 0.875 (ranging from 0.782 for HTG07 to 0.921 for HMS07). This was higher than what was found by Bjornstad and Roed (2002) in the English Thoroughbred breed and by Luis et al (2007) for the Sorraia breed but was similar to the findings of Shahsavarani and Rahimi-Mianji (2010) for the Caspian horse and Avdi and Banos (2008) for the Greek Skyros breed. Several markers displayed a significant deficit of heterozygotes due to within-population inbreeding in both subspecies and in the combined analysis.…”

Section: Resultssupporting

confidence: 85%

Genetic variability in local Brazilian horse lines using microsatellite markers

Silva¹,

Paiva²,

Albuquerque³

et al. 2012

Genet. Mol. Res.

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ABSTRACT. Genetic variability at 11 microsatellite markers was analyzed in five naturalized/local Brazilian horse breeds or genetic groups. Blood samples were collected from 328 animals of the breeds Campeira (Santa Catarina State), Lavradeira (Roraima State), Pantaneira (Pantanal Mato-Grossense), Mangalarga Marchador (Minas Gerais State), as well as the genetic group Baixadeiro (Maranhão State), and the exotic breeds English Thoroughbred and Arab. We found significant genetic variability within evaluated microsatellite loci, with observed heterozygosis varying between 0.426 and 0.768 and polymorphism information content values of 0.751 to 0.914. All breeds showed high inbreeding coefficients and were not in Hardy-Weinberg equilibrium. The smallest genetic distance was seen between the Pantaneira and Arab breeds. The principal component analyzes and Bayesian approach demonstrated that the exotic breeds have had a significant influence on the genetic formation of the local breeds, with introgression of English Throroughbred in Pantaneira and Lavradeira, as well as genetic proximity between the Arab, Pantaneira and Mangalarga Marchador populations. This study shows the need to conserve traits acquired by naturalized horse breeds over centuries of natural selection in Brazil due to the genetic uniqueness of each group, suggesting a reduced gene flow between them. These results reinforce the need to include these herds in animal genetic resource conservation programs to maximize the genetic variability and conserve useful allele combinations.

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“…Many other studies have reported inbreeding results in horse breeds and their analyses show that the mean coefficient of inbreeding differs for different breeds and within the same breed in different countries. The average coefficient of inbreeding observed in this population was similar to findings by Sairanen et al (2009) for Standardbred trotters, and by Avdi and Banos (2008) for the endangered Skyros breed, but it was slightly smaller than those reported by Vostrá-Vydrová et al (2016) in grey horses and in Black horses. Moreover, the average inbreeding values observed in some farms were higher than those found in some dog breeds (Ciampolini et al, 2013;Cecchi et al, 2018) that use commonly and notoriously inbreeding as a mating method.…”

Section: Discussionsupporting

confidence: 81%

Effect of inbreeding on the “Club Foot” disorder in Arabian Pureblood horses reared in Italy

Comparini¹,

Podestà²,

Russo³

et al. 2019

Open Vet J.

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Background: "The Club Foot" (or "Mismatched Foot") is an acquired or congenital flexural deformity of the distal interphalangeal joint, caused by a shortening of the musculotendinous unit of the deep digital flexor tendon. Aim: The aim of this research was to detect the incidence of the disorder in Arabian Pureblood horses, attempting to understand its causes and to analyze a possible role of inbreeding in its expression. In this breed, in fact, the pathology is widespread because in the environment of origin, the rocky desert, a hard and almost goat's hoof is not disabling so the selection against this disorder has never been done. Methods: Pedigrees were taken from 141 (reference population = RP) adult Arabian Pureblood horses (51 males and 90 females) belonging to eight Italian different farms during the period 1982-2017. For each horse, the presence or not of the disorder was observed and inbreeding coefficients (F) was performed. Four grades of deformity were considered. Moreover, the environmental condition of each farm was considered: boxes, paddocks, nutrition, orientation, and hoof care and shoeing. The chi-square test was applied. Analysis of variance (ANOVA) was used to test the differences in the average inbreeding coefficient (F) between affected and healthy animals, between sexes and between shod and unshod animals. Results: Two grades of deformity were observed (I and II) which give less severe manifestations, with 28 females and 25 males (37.59% of the examined horses) showing the disorder. No differences between males and females or between shod (38.29%) and unshod (61.70%) were observed. Environmental conditions do not influence the rate of pathology in the different farms, with a prevalence of the disorder ranging from 7.69% up to 100% on farm. The whole population (WP = RP and its genealogy) included 3,355 records subdivided in seven traced generations. One hundred and eighteen out of 141 horses (RP) were inbred (83.69%). The average inbreeding coefficient (F) in the RP was 0.095. Inbreeding coefficient in RP was <0.05 in only 15 horses (12.71% of inbred), whereas it was >0.25 in 28 horses (23.73% of inbred). Conclusion: High inbreeding coefficients were observed in all farms and in particularly in affected animals suggesting that high inbreeding coefficients increases the probability that the disorder occurs. Future works may include the study of the hereditability of the character, and the attempt to identify loci associated with the disorder.

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Genetic diversity and inbreeding in the Greek Skyros horse

Cited by 21 publications

References 8 publications

Genetic diversity in Hucul and Polish primitive horse breeds

Genetic diversity in Hucul and Polish primitive horse breeds

Genetic variability in local Brazilian horse lines using microsatellite markers

Effect of inbreeding on the “Club Foot” disorder in Arabian Pureblood horses reared in Italy

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