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Animal : an international journal of animal bioscience2016; 11(6); 948-957; doi: 10.1017/S1751731116002214

Designing an early selection morphological linear traits index for dressage in the Pura Raza Español horse.

Abstract: Making a morphological pre-selection of Pura Raza Español horses (PRE) for dressage is a challenging task within its current breeding program. The aim of our research was to design an early genetic selection morphological linear traits index to improve dressage performance, using 26 morphological linear traits and six dressage traits (walk, trot, canter, submission, general impression - partial scores - and total score) as selection criteria. The data set included morphological linear traits of 10 127 PRE (4159 males and 5968 females) collected between 2008 and 2013 (one record per horse) and 19 095 dressage traits of 1545 PRE (1476 males and 69 females; 12.4 records of average) collected between 2004 and 2014. A univariate animal model was applied to predict the breeding values (PBV). A partial least squares regression analysis was used to select the most predictive morphological linear traits PBV on the dressage traits PBV. According to the Wold Criterion, the 13 morphological linear traits (width of head, head-neck junction, upper neck line, neck-body junction, width of chest, angle of shoulder, lateral angle of knee, frontal angle of knee, cannon bone perimeter, length of croup, angle of croup, ischium-stifle distance and lateral hock angle) most closely related to total score PBV, partial scores PBV and gait scores PBV (walk, trot and canter) were selected. A multivariate genetic analysis was performed among the 13 morphological linear traits selected and the six dressage traits to estimate the genetic parameters. After it, the selection index theory was used to compute the expected genetic response using different strategies. The expected genetic response of total score PBV (0.76), partial scores PBV (0.04) and gait scores PBV (0.03) as selection objectives using morphological linear traits PBV as criteria selection were positive, but lower than that obtained using dressage traits PBV (1.80, 0.16 and 0.14 for total score PBV, partial scores PBV and gait scores PBV) or dressage traits PBV and morphological linear traits PBV (2.97, 0.16 and 0.15 for total score PBV, partial scores PBV and gait scores PBV), as selection criteria. This suggests that it is possible to preselect the PRE without dressage traits PBV using as selection criteria the morphological linear traits PBV, but the expected genetic response will be lower.
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Publication Date: 2016-11-14 PubMed ID: 27839527DOI: 10.1017/S1751731116002214Google Scholar: Lookup
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Summary

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This research aims to establish a pre-selection criterion for Pura Raza Español horses for dressage based on morphological traits. It utilizes 26 morphological traits and six dressage traits including walk, trot, canter, submission, and general impression to design an early genetic selection index. The data suggest that this method of pre-selection can be effective but the genetic response might be lower compared to the selection based on dressage traits.

Objective of the Study

  • This research aims to design an early genetic selection morphological linear traits index for the selection of Pura Raza Español (PRE) horses suited for dressage.

Study Methodology

  • The study uses 26 morphological linear traits and six dressage traits as selection criteria. The dressage traits include walk, trot, canter, submission, general impression, and total score.
  • The data set used for analysis includes morphological linear traits of 10,127 PRE horses (4159 males and 5968 females) collected over five years (2008- 2013) and 19,095 dressage traits of 1545 PRE horses (1476 males and 69 females) collected over a decade (2004- 2014).
  • The researchers employed a univariate animal model to predict the breeding values (PBV).
  • A partial least squares regression analysis was used to select the morphological linear traits PBV that had the most prediction capacity on the dressage traits PBV.

Study Findings

  • The study identified 13 morphological linear traits that are most closely related to total score PBV, partial scores PBV, and gait scores PBV. These traits include the width of the head, head-neck junction, upper neck line, neck-body junction, width of chest, angle of shoulder, lateral angle of knee, frontal angle of knee, cannon bone perimeter, length of croup, angle of croup, ischium-stifle distance, and lateral hock angle.
  • Genetic parameters were estimated using multivariate genetic analysis among the 13 selected morphological linear traits and the six dressage traits.
  • The study demonstrated that the expected genetic response of selection using morphological linear traits PBV as selection criteria was positive, but lower than that obtained using dressage traits PBV or dressage traits PBV and morphological linear traits PBV, as selection criteria.

Conclusion

  • The research concluded that it is possible to preselect PRE for dressage using the morphological linear traits PBV as a selection criterion. However, the expected genetic response achieved is lower than that achieved using dressage traits PBV as selection criteria.

Cite This Article

APA
Sánchez-Guerrero MJ, Cervantes I, Molina A, Gutiérrez JP, Valera M. (2016). Designing an early selection morphological linear traits index for dressage in the Pura Raza Español horse. Animal, 11(6), 948-957. https://doi.org/10.1017/S1751731116002214

Publication

Animal : an international journal of animal bioscience
ISSN: 1751-732X
NlmUniqueID: 101303270
Country: England
Language: English
Volume: 11
Issue: 6
Pages: 948-957

Researcher Affiliations

Sánchez-Guerrero, M J
  • 1Departamento de Ciencias Agro-Forestales,Universidad de Sevilla,Ctra. Utrera km 1,41013 Sevilla,Spain.
Cervantes, I
  • 2Departamento de Producción Animal.Universidad Complutense de Madrid,Avda. Puerta de Hierro s/n,28040 Madrid,Spain.
Molina, A
  • 3Departamento de Genética,Universidad de Córdoba,Ctra. Madrid-Cadiz Km.396,14071 Córdoba,Spain.
Gutiérrez, J P
  • 2Departamento de Producción Animal.Universidad Complutense de Madrid,Avda. Puerta de Hierro s/n,28040 Madrid,Spain.
Valera, M
  • 1Departamento de Ciencias Agro-Forestales,Universidad de Sevilla,Ctra. Utrera km 1,41013 Sevilla,Spain.

MeSH Terms

  • Animals
  • Breeding
  • Female
  • Gait / genetics
  • Gait / physiology
  • Horses / anatomy & histology
  • Horses / genetics
  • Horses / physiology
  • Male
  • Phenotype
  • Physical Conditioning, Animal
  • Selection, Genetic

Citations

This article has been cited 16 times.
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