Genetic analysis of competition data on Icelandic horses

Albertsdóttir, E.; Eriksson, Staffan; Näsholm, A.; Strandberg, E.; Árnason, Þorvaldur

doi:10.1016/j.livsci.2006.11.008

Cited by 23 publications

(23 citation statements)

References 8 publications

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“…Knowledge of such effects within equine competition is limited; however, previous authors [19][20][21][22] have highlighted that they are occurring. Particular regard has to be given to the potential influence of environmental factors and whether they are random or systematic fixed effects.…”

Section: At Intermediate)mentioning

confidence: 99%

The influence of horse gender on eventing competition performance

Whitaker

Olusola

Redwin

2008

CEP

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The study undertook comparative analysis of horse gender and eventing performance. Limited previous research has investigated the impact horse gender may have on performance. However, many competitors have a preference for one gender over another (normally geldings). The study sampled five levels of the sport (intro, pre-novice, novice, intermediate and advanced) and investigated dependent variable penalty scores within the dressage, show jumping and cross-country phases; additionally, final penalty score, rank in competition and lifetime score were analysed. Results indicated the effect of gender to be limited. Issues relating to sample size, data structure and scoring mechanisms are discussed further.

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Section: At Intermediate)mentioning

confidence: 99%

The influence of horse gender on eventing competition performance

Whitaker

Olusola

Redwin

2008

CEP

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“…These characteristics produce an unbiased estimation of the RHI that, together with the major disequilibrium included in the evaluation models, has excluded this factor from most of the genetic models (Albertsdóttir et al . ). However, not taking into consideration, this interaction could produce a bias in the genetic estimations that could influence the response to selection.…”

Section: Introductionmentioning

confidence: 97%

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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“…Icelandic horse breeders emphasize multi‐gaiting ability, a good spirit and an aesthetic and functional conformation in their horses (Albertsdóttir et al. 2007, 2008).…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis of ‘breeding field test status’ in Icelandic horses

Albertsdóttir

Eriksson

Sigurdsson

et al. 2011

Journal of Animal Breeding and Genetics

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Genetic evaluation of Icelandic horses is currently based on results from breeding field tests where riding ability and conformation of the horses are evaluated over the course of 1-2 days. Only a small part of registered horses attend these field tests, and it can be assumed that these are not a random sample of the population. In this study, the trait test status was introduced, describing whether a horse was assessed in a breeding field test. This trait was analysed to find out whether it has a genetic variation and how it correlates genetically to other traits in the breeding goal. Breeding field test data included 39,443 mares born in Iceland in 1990-2001, of which 7431 were assessed in the period 1994-2007. The trait was defined in relation to age, gender and stud of horses. Variance and covariance components were estimated using the Markov Chain Monte Carlo method by applying the Gibbs sampler procedure in the DMU program. Three multivariate analyses were performed where the test status trait was analysed with breeding field test traits. Animal models and sire models were applied. Based on estimated heritabilities (0.51-0.67) and genetic correlations (0.00-0.87), the test status trait showed significant genetic variation and was strongly correlated to some traits. The test status trait reflects preselection in the breeding field test traits and should be included in the genetic evaluation to enhance the procedure, reduce selection bias and increase accuracy of the estimation.

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Genetic analysis of competition data on Icelandic horses

Cited by 23 publications

References 8 publications

The influence of horse gender on eventing competition performance

The influence of horse gender on eventing competition performance

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

Genetic analysis of ‘breeding field test status’ in Icelandic horses

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