Genetic correlations between osseous fragments in fetlock and hock joints, deforming arthropathy in hock joints and pathologic changes in the navicular bones of Warmblood riding horses

Stock, K. F.; Distl, O.

doi:10.1016/j.livsci.2006.04.027

Cited by 25 publications

(28 citation statements)

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“…The heritability and additive genetic correlation estimates obtained in this study for radiographic findings, conformation and performance traits were low to moderate and in agreement with the literature (Stock and Distl, 2006a, 2006cand 2007Thoré n Hellsten et al, 2006). Selection on only one trait will therefore lead to some correlated selection response, the size and direction of which is determined by the heritabilities of, and the additive genetic correlations between, the traits involved (Stock and Distl, 2006b). However, under the given conditions with closer correlations between traits from the same trait group than between traits from different trait groups, correlated selection responses will not be sufficiently large to relevantly influence the distributions of other traits than those selected for.…”

Section: Discussionsupporting

confidence: 89%

“…Moderately negative additive genetic correlations have been previously estimated between the four most important radiographic findings in the limbs of young Warmblood horses (Stock and Distl, 2006b). The heritability and additive genetic correlation estimates obtained in this study for radiographic findings, conformation and performance traits were low to moderate and in agreement with the literature (Stock and Distl, 2006a, 2006cand 2007Thoré n Hellsten et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Much importance is therefore attached to the health of the equine locomotory system, including the radiographic health of the limbs. Several studies have shown the heritable nature of these radiographic findings that were most frequently seen in the limbs of young Warmblood riding horses (Stock and Distl, 2006b). Selection for radiologically healthy horses should be possible and beneficial with regard to long-term usability of the horses, but such selection objective needs to fit the existing breeding and selection strategies.…”

Section: Introductionmentioning

confidence: 99%

“…However, no conformation traits and no distinct performance traits such as quality of trot or rideability have been directly related to the most -E-mail: Kathrin-Friederike.Stock@tiho-hannover.de important radiographic findings yet. Given the significant genetic correlations within and between the groups of conformation, performance and radiographic health traits in the Warmblood horse (Koenen et al, 1995;Stock and Distl, 2006a, 2006b, 2006cand 2007Thorén Hellsten et al, 2006), accuracy of genetic evaluation and expected selection responses should benefit from joint genetic analysis of all traits relevant for selection. The objectives of this study were to estimate genetic parameters and predict breeding values for conformation, performance and radiographic health traits in the Warmblood riding horse and to compare the expected selection responses to different modes of sire selection.…”

Section: Introductionmentioning

confidence: 99%

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Multiple-trait selection for radiographic health of the limbs, conformation and performance in Warmblood riding horses

Stock

Distl

2008

Animal

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Information on 26 434 German Warmblood horses born between 1992 and 2001 was used for multivariate genetic analyses of radiographic health, conformation and performance traits to compare different modes of single-and multiple-trait selection of sires. Results of standardized radiological examinations of 5155 Hanoverian Warmblood horses, conformation evaluations from studbook inspections of 20 603 mares, and performance evaluations from mare performance tests and auction horse inspections of 16 098 horses were used for multivariate genetic analyses. Genetic parameters were estimated with restricted maximum likelihood (REML), and relative breeding values (RBV) were predicted with best linear unbiased prediction (BLUP) in multivariate linear animal models for four radiographic health traits, three conformation traits and five performance traits. Heritability estimates for osseous fragments in fetlock joints (OFF), osseous fragments in hock joints (OFH), deforming arthropathy in hock joints (DAH) and distinct radiographic findings in the navicular bones (DNB) ranged between 0.15 and 0.35 after transformation to the liability scale. Front limb conformation, hind limb conformation, withers height, walk, trot, canter, rideability and free jumping showed heritabilities between 0.09 and 0.49 and additive genetic correlations with OFF, OFH, DAH and DNB ranging between 20.53 and 10.52. Selection of sires was based on RBV or combinations of RBV, with selection for individual traits or traits from one of the three considered trait groups being considered as single-trait selection, and selection for traits from more than one trait group being considered as multiple-trait selection. The selection modes were compared by means of the expected selection response after one generation, calculated as the relative change in the prevalences of the radiographic findings or the mean conformation or performance scores in the offspring of the selected sires when compared with the offspring of all sires. The prevalences of OFF, OFH, DAH and DNB decreased by 30% to 57% after single-trait selection and 14% to 29% after multiple-trait selection, while mean conformation and performance scores increased by up to 4%. The results indicated that it is possible to simultaneously improve the radiographic health of the limbs, limb conformation, quality of gaits and rideability. However, genetic progress in free jumping ability and style could only be achieved by single-or multiple-trait selection with focus on jumping performance.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiple-trait selection for radiographic health of the limbs, conformation and performance in Warmblood riding horses

Stock

Distl

2008

Animal

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“…Consistent selection for functional conformation might assist, but cannot replace breeding measures which are based on results of radiological examinations of horses. Despite antagonistic genetic correlations between individual radiographic findings [35,37] it has been shown that appropriate breeding measures can concurrently lower the prevalences of the four quantitatively most important radiographic findings in the limbs of riding horses [34,38]. Combined use of conformation and radiological data will facilitate and accelerate selection progress with respect to the radiological health of the limbs of young Warmblood riding horses.…”

Section: Discussionmentioning

confidence: 99%

Genetic correlations between conformation traits and radiographic findings in the limbs of German Warmblood riding horses

Stock

Distl

2006

Genet. Sel. Evol.

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-Studbook inspection (SBI) data of 20 768German Warmblood mares and radiography results (RR) data of 5102 Hanoverian Warmblood horses were used for genetic correlation analyses. The scores on a scale from 0 to 10 were given for conformation and basic quality of gaits, resulting in 14 SBI traits which were used for the correlation analyses. The radiographic findings considered included osseous fragments in fetlock (OFF) and hock joints (OFH), deforming arthropathy in hock joints (DAH) and distinct radiographic findings in the navicular bones (DNB) which were analyzed as binary traits, and radiographic appearance of the navicular bones (RNB) which was analyzed as a quasi-linear trait. Genetic parameters were estimated multivariately in linear animal models with REML using information on 24 448 horses with SBI and/or RR records. The ranges of heritability estimates were h 2 = 0.14−0.34 for the RR traits and h 2 = 0.09−0.50 for the SBI traits. Negative additive genetic correlations of r g = −0.19 to −0.56 were estimated between OFF and conformation of front and hind limbs and walk at hand, and between DNB and hind limb conformation. There were indications of negative additive genetic correlations between DAH and all SBI traits, but because of low prevalence and low heritability of DAH, these results require further scrutiny. Positive additive genetic correlations of r g = 0.37−0.52 were estimated between OFF and withers height and between OFH and withers height, indicating that selection for taller horses will increase disposition to develop OFF and OFH. Selection of broodmares with regards to functional conformation will assist, but cannot replace possible selection against radiographic findings in the limbs of young Warmblood riding horses, particularly with regards to OFF. riding horse / conformation / studbook inspection / radiographic finding / additive genetic correlation

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Genomics of Skeletal Disorders

Distl

2013

Equine Genomics

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Genetic correlations between osseous fragments in fetlock and hock joints, deforming arthropathy in hock joints and pathologic changes in the navicular bones of Warmblood riding horses

Cited by 25 publications

References 28 publications

Multiple-trait selection for radiographic health of the limbs, conformation and performance in Warmblood riding horses

Multiple-trait selection for radiographic health of the limbs, conformation and performance in Warmblood riding horses

Genetic correlations between conformation traits and radiographic findings in the limbs of German Warmblood riding horses

Genomics of Skeletal Disorders

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