Breeding value estimation in the Hungarian Sport Horse population

Posta, József; Komlósi, István; Mihok, Steve

doi:10.1016/j.tvjl.2009.03.006

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…() for Swedish Warmblood riding horses ( h 2 = 0.18), but slightly higher than those reported by Posta et al . () in Hungarian horses (between 0.02 and 0.07). On the other hand, MTAM values were within the range of those reported by Ruhlmann et al .…”

Section: Resultsmentioning

confidence: 98%

Genetic (co)variance components across age for Show Jumping performance as an estimation of phenotypic plasticity ability in Spanish horses

Bartolomé

Menéndez-Buxadera

Valera

et al. 2012

J Animal Breeding Genetics

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The purpose of this study was to study phenotypic plasticity ability for Show Jumping performance in horses according to age differences. For this study, 11 352 participations, belonging to 1085 horses grouped by age (4-, 5- or 6-year olds), were analysed. repeatability animal models (RAM) and multiple trait animal models (MTAM) were compared. RAM assumed the same covariance components for all age groups, whereas MTAM considered the results of every animal at every age group as different (but correlated) traits. The age, sex, starting order and training level were included as fixed effects. The random effects were the animal, the individual permanent environment, the competition and the rider. Six models were compared, and the rider-horse interaction was added as a random effect; furthermore, heterogeneous residual variance was taken into consideration only for MTAM. The study of the genetic correlations between age groups highlighted the presence of an age-genotype interaction and, therefore, an underlying environmental effect. This study may allow us to select horses with a plastic response, which show either a gradual response or a precocious response and thus gain or lose genetic potential with age, respectively.

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Section: Resultsmentioning

confidence: 98%

Genetic (co)variance components across age for Show Jumping performance as an estimation of phenotypic plasticity ability in Spanish horses

Bartolomé

Menéndez-Buxadera

Valera

et al. 2012

J Animal Breeding Genetics

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“…The benefits of organized breeding programs have been assessed for several horse breeds (Dubois et al, 2008;Jaitner and Reinhardt, 2003;Kearsley et al, 2008;Posta et al, 2009), and the possibility has been suggested of harmonizing selection programs across different breeds and countries with the same breeding objectives (Bruns et al, 2004;Koenen and Aldridge, 2002). In the particular case of Lusitano horses, the definition of breeding objectives is not an easy task, because selection is aimed at multiple purposes and both morphology/gaits and functional traits should be taken into account.…”

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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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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“…Based on the progressive character of CPL and the uncertainty of the 'ultimate phenotype' of young horses, we decided to analyse two sets of data: a complete set and a reduced set containing only horses older than the age of 3 years. Variance components were obtained in a multitrait animal model, previously used in horses for the estimation of genetic parameters for performance traits (Miglior et al 1998;Posta et al 2009;Viklund et al 2010;Olsen et al 2012) as well as disease-associated traits (Stock et al 2005;Peeters et al, 2011). A multitrait approach provides insight into the genetic relationships between traits and, in general, yields more reliable estimates than univariate models.…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters for chronic progressive lymphedema in Belgian Draught Horses

Keyser

Janssens

Peeters

et al. 2014

J Animal Breeding Genetics

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Genetic parameters for chronic progressive lymphedema (CPL)-associated traits in Belgian Draught Horses were estimated, using a multitrait animal model. Clinical scores of CPL in the four limbs/horse (CPLclin ), skinfold thickness and hair samples (hair diameter) were studied. Due to CPLclin uncertainty in younger horses (progressive CPL character), a restricted data set (D_3+) was formed, excluding records from horses under 3 years from the complete data set (D_full). Age, gender, coat colour and limb hair pigmentation were included as fixed, permanent environment and date of recording as random effects. Higher CPLclin certainty (D_3+) increased heritability coefficients of, and genetic correlations between traits, with CPLclin heritabilities (SE) for the respective data sets: 0.11 (0.06) and 0.26 (0.05). A large proportion of the CPLclin variance was attributed to the permanent environmental effect in D_full, but less in D_3+. Date of recording explained a proportion of variance from 0.09 ± 0.03 to 0.61 ± 0.08. Additive genetic correlations between CPLclin and both skinfold thickness and hair diameter showed the latter two traits cannot be used as a direct diagnostic aid for CPL. Due to the relatively low heritability of CPLclin , selection should focus on estimated breeding values (from repeated clinical examinations) to reduce CPL occurrence in the Belgian Draught Horse.

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Breeding value estimation in the Hungarian Sport Horse population

Cited by 18 publications

References 6 publications

Genetic (co)variance components across age for Show Jumping performance as an estimation of phenotypic plasticity ability in Spanish horses

Genetic (co)variance components across age for Show Jumping performance as an estimation of phenotypic plasticity ability in Spanish horses

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

Genetic parameters for chronic progressive lymphedema in Belgian Draught Horses

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