Genetic correlations between similar traits in the Danish and Swedish Warmblood sport horse populations

Hellsten, E. Thorén; Jorjani, H.; Philipsson, J.

doi:10.1016/j.livsci.2008.11.021

Cited by 18 publications

(15 citation statements)

References 11 publications

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“…In what concerns functionality, the heritability estimates for performance in dressage events reported in the literature usually range between 0.1 and 0.3 (Ricard et al, 2000;Stewart et al, 2010;Thoren Hellsten et al, 2009), in line with our estimate of 0.32 for dressage score. To our knowledge, genetic parameters for working equitation have not been reported so far, but our estimate of heritability for the dressage trial (0.32) is identical to that obtained for classical dressage.…”

Section: Discussionsupporting

confidence: 89%

“…For example, the heritability of height at withers has been reported to be 0.88 in Thoroughbreds above one year of age (Hintz et al, 1978), 0.20 in the Dutch Warmblood (Koenen et al, 1995), 0.79 in the Haflinger breed (Miglior et al, 1998), 0.73 in Norwegian Cold-blooded Trotters (Dolvik and Klemetsdal, 1999), 0.59 in the Andalusian horse (Molina et al, 1999), 0.47 in the Mangalarga breed (Mota et al, 2006), 0.67 in Austrian Noriker draught horse (Druml et al, 2008) and 0.34 in the Belgian warmblood horse (Rustin et al, 2009). For morphological partial scores, heritability estimates for leg stances are generally in the range of 0.08 (Druml et al, 2008;Saastamoinen et al, 1998;Thoren Hellsten et al, 2009) and 0.29 (Molina et al, 1999), while for overall type impression the heritability estimates are usually between about 0.20 (Christmann et al, 1995) and 0.30 (Albertsdottir et al, 2008). The heritability of gaits and movements may differ for walk, trot and canter (Albertsdottir et al, 2008), but the overall gaits score generally has an estimated heritability of about 0.15-0.20 (Molina et al, 1999;Preisinger et al, 1991;Saastamoinen et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

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Selection for morphology, gaits and functional traits in Lusitano horses: I. Genetic parameter estimates

et al. 2014

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a b s t r a c tGenetic parameters were estimated for morphology, gaits and functional traits in Lusitano horses by uni-and multivariate animal models. Morphological traits considered in the analyses were partial scores attributed to up to 18,076 horses at the time of registration in the studbook and included head and neck, shoulder and withers, chest and thorax, back and loin, croup, legs and overall impression, plus a final score computed by summing the partial morphological scores and the gaits score. The functional traits considered were the scores obtained in the dressage and maneability trials of working equitation (WE, about 1500 records by 200 horses), and classical dressage (12,131 records by 759 horses). The heritability (h 2 ) estimates for all partial morphological scores ranged between 0.12 and 0.18, except for legs (0.07). The h 2 for final score, height at withers and gaits was 0.18, 0.61 and 0.17, respectively, while for WE dressage trial and classical dressage it was 0.32 and for WE maneability trial it was 0.18. The genetic correlations (r G ) of final score with the different partial scores were generally high (0.56-0.95), while among partial components of morphology they were positive but widely different (0.08-0.77). With the exception of legs, r G between morphology/gaits and functional traits were positive, with a stronger relationship between morphological traits and performance in WE dressage trial (r G between 0.36 and 0.56) when compared with performance in maneability trial or classical dressage. Height at withers had a r G of 0.40 with performance in classical dressage, but lower r G (0.06 and À 0.10) with WE trials. Final score and overall impression had moderate to strong genetic relationships with functional traits, especially with WE dressage trial, while gaits had a strong r G with performance in all the disciplines (0.60-0.72). Indirect selection for morphology/gaits to improve functionality was assessed, by selecting for final score or a combined index of partial scores. Compared to direct selection for functionality, selection for final score or an index combining partial morphological scores would be less effective, resulting in accuracies of, respectively, 0.28 and 0.37 for WE dressage trial, 0.14 and 0.38 for WE maneability trial and 0.22 and 0.39 for classical dressage. Thus, an index combining all partial morphological scores would be better than selection for overall final score, but its relative efficiency compared to direct selection would be about 0.7 in WE dressage trial and classical dressage, and 0.9 in WE maneability trial. Lusitano horses maintain considerable levels of genetic variability, and selection for both morphology and functionality should be effective. The favorable genetic relationships existing between morphology and performance indicate that morphology/gaits traits can play an important role in a two-stage selection program, contributing to enhance selection

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Selection for morphology, gaits and functional traits in Lusitano horses: I. Genetic parameter estimates

et al. 2014

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“…; Thorén‐Hellsten et al . ). The genetic correlations between traits defined as DH or JH were equal or higher than those presented by Viklund et al .…”

Section: Discussionmentioning

confidence: 97%

Effect of specialization on genetic parameters of studbook–entry inspection in Dutch Warmblood horses

Rovere

Madsen

Norberg

et al. 2015

J Animal Breeding Genetics

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Recent studies on data from the Dutch Warmblood Studbook (KWPN) have shown that the ongoing specialization of horses for either dressage (DH) or show jumping (JH) has led to a decreasing genetic relationship between the two subpopulations. The aim of this study was to analyse the effect of the specialization process on the genetic parameters of traits measured in the studbook-entry inspection of KWPN during the last fifteen years. Data from 18,125 DH and 23,800 JH recorded from 1998 until 2013 were used to analyse 13 traits scored in both DH and JH. Analyses were performed in a Bayesian framework. Firstly, variance components were estimated based on the whole data set. Secondly, genetic correlations between traits measured in DH or JH were estimated using bivariate analyses. Thirdly, three time periods were defined and genetic correlations between subpopulations were estimated within each period. Heritability was moderate (0.17-0.39) for both DH and JH. Genetic correlations between traits measured in DH or JH were not different from one considering the posterior standard deviation of the estimation; however, in most of the traits, a clear trend in reduction of the genetic correlation for traits expressed in DH and JH and an increase in their posterior standard deviation for recent years was observed. These results suggest that specialization could lead to differences in traits measured in DH and JH in the recent years.

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“…A positive genetic trend has been achieved in different equestrian disciplines, including dressage, show jumping, eventing and endurance (Ricard and Touvais, 2007;Thoren Hellsten et al, 2009;Viklund et al, 2011), but also in conformation aspects (Albertsdottir et al, 2011;Fioretti et al, 2005;Miglior et al, 1998). For racing performance, however, the results have been less consistent, because even though a positive genetic trend for speed has been reported for several breeds (Gaffney and Cunningham, 1988;Klemetsdal, 1992;Mota et al, 2005;Oki and Sasaki, 1996;Olsen et al, 2011;Willham and Wilson, 1991), no reduction in winning times has been observed for the major horse races over the last 50 years (Gardner, 2006).…”

Section: Introductionmentioning

confidence: 99%

Selection for morphology, gaits and functional traits in Lusitano horses: II. Fixed effects, genetic trends and selection in retrospect

et al. 2014

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a b s t r a c tMixed model procedures were used to analyze morphology and gaits records collected in about 18,000 Lusitano horses from 900 studs, over a period of 43 years, and functional records collected since 1998, to carry-out a critical assessment of the fixed effects and selection practices followed in this breed. Fixed effects considered in the analysis of morphology (head/ neck, shoulder/withers, chest/thorax, back/loin, croup, legs and overall impression), gaits and final score (computed by summing partial morphological and gaits scores) were stud, year, sex, inbreeding and age. Functional traits analyzed were the scores obtained in working equitation dressage (WEDT) and maneability (WEMT) trials and in classical dressage (CD), where fixed effects were event, level of competition, sex, inbreeding and age. Phenotypic trends were moderate over the period analyzed, with a slight increase in height at withers, and a decline in final score. Nevertheless, differences among years were mostly environmental. Males received lower scores for almost all morphological and gaits traits except croup, with a difference of about À 1.7 points for final score relative to females. Sex differences were small for functional traits, with general advantage of males in WEMT and CD, and a disadvantage in WEDT. Considerable differences were detected among studs, especially in their environmental effects but also in mean estimated breeding value (EBV), for morphology, gaits and functionality. The environmental effect of competition level in CD resulted in a progressively lower scoring as the competition became more difficult, while for WEMT the pattern was opposite and differences were minor for WEDT. Inbreeding depression was observed for all morphological and gait traits, but the magnitude of its impact was very small for all traits analyzed, never exceeding À 0.1% of the mean per 1% inbreeding. Still, for functional traits the effect of inbreeding was negligible. The EBV for morphology, gaits, WEMT and WEDT show considerable variability, indicating that selection can be effective. For CD, however, the distribution of EBV was narrower. The genetic trend was positive but moderate for all traits, and it was slightly higher for head and neck, overall impression, gaits and final score. As a percentage of the mean, these traits and working equitation trials showed the highest responses, which in the best cases did not exceed 0.2% of the mean per year. Genetic selection differentials and the corresponding selection intensities were very modest for all traits analyzed, with a slightly higher intensity in sires when compared to dams.& 2014 Elsevier B.V. All rights reserved.

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Genetic correlations between similar traits in the Danish and Swedish Warmblood sport horse populations

Cited by 18 publications

References 11 publications

Selection for morphology, gaits and functional traits in Lusitano horses: I. Genetic parameter estimates

Selection for morphology, gaits and functional traits in Lusitano horses: I. Genetic parameter estimates

Effect of specialization on genetic parameters of studbook–entry inspection in Dutch Warmblood horses

Selection for morphology, gaits and functional traits in Lusitano horses: II. Fixed effects, genetic trends and selection in retrospect

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