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Home / Equine Research Bank / Trop Anim Health Prod / Brazilian Sport Horse: genetic parameters for approval of Br...
Tropical animal health and production2019; 52(4); 1669-1680; doi: 10.1007/s11250-019-02168-7

Brazilian Sport Horse: genetic parameters for approval of Brasileiro de Hipismo stallions.

Abstract: The aim of this study was to evaluate genetic parameters for subjective scores given at the Brazilian Sport Horse (BSH) Stallion Approval by estimating heritability (h) for morphological, gait, and jumping traits and genetic correlations (γ) among the functional ones and by verifying selection feasibility. The analysis included 1179 complete evaluations from 294 horses, by 4.26 ± 0.96 judges. Each trait was evaluated using mixed models in SAS® v9.2, considering the individual as a random effect. Variance components and genetic parameters were obtained by single and two-trait animal models in a derivative-free restricted maximum likelihood analysis. Since many jumping traits were not described in Breed Regulation, mixed model results were used to enlighten the criteria adopted in the assignment of scores. Balanced bodies and conformations that favor collection were preferred by judges and presented moderate heritabilities. Additive variation was found for most jumping traits, with heritability equal to 0.74 (se = 0.04) for overall jump, and estimates for the separate aspects of the jump movement ranging from near null to 0.43 (se = 0.07) for temperament. Morphological scores had little effect over gait and jump scores while trot may be indicative of some additive value for jump distance and canter for hind limb mechanics. Conformation evaluations of separate body regions presented heritability estimates similar to previous studies and may provide more informative breeding values.
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Publication Date: 2019-12-19 PubMed ID: 31858372DOI: 10.1007/s11250-019-02168-7Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article studied the genetic parameters that influence the selection of stallions in the Brazilian Sport Horse breed. Through detailed evaluation of traits like morphology, gait, and jumping, it arrived at the understanding of significant heritability of several traits and the possibility of genetic correlations. The results could potentially be used for selective breeding within the breed.

Research Methodology

  • The research involved an analysis of complete evaluations of 1,179 stallions, judged by an average of around four judges per horse. All these horses belonged to the Brasileiro de Hipismo or Brazilian Sport Horse breed.
  • The traits being evaluated were broadly categorized into morphological, gait, and jumping traits, thus encompassing the physical characteristics as well as functional abilities of the horse.
  • The statistical software SAS v9.2 was used for analyzing the data. The individual horse was considered a random effect in these mixed models.
  • To arrive at the genetic parameters like variance components, single and two-trait animal models were used in a derivative-free restricted maximum likelihood analysis.

Key Findings

  • The study found that traits associated with balanced bodies and conformations that favor collection were preferred by judges and exhibited moderate heritability rates – meaning these traits are likely to be passed on from generation to generation.
  • Genetic variation was observed for most jumping traits, with the highest heritability found to be 0.74 for the overall jump, while the separate aspects of jump movement varied from near null to 0.43 for temperament.
  • Interestingly, the study found that morphological scores (related to the horse’s physical structure) had little influence over the scores for gait and jump. This suggests that a horse’s physical appearance doesn’t significantly impact its functional abilities.
  • In contrast, the horse’s trot was found to possibly be indicative of some additive value for jump distance, while canter could impact hind limb mechanics.
  • Similar to past studies, heritability estimates of evaluations of separate body regions were somewhat consistent. This could be useful for providing more precise breeding values.

Implications of the Study

  • The insights from this study can be valuable for breeding programs of Brazilian Sport Horses and possibly, other Sport Horse breeds as well. By understanding the heritability of certain traits, breeders can make more informed decisions when selecting stallions for breeding.
  • This research further underscores the potential role of genetics in enhancing specific functional abilities in horses, like jumping.

Cite This Article

APA
Medeiros BR, Garbade P, Seixas L, Peripolli V, McManus C. (2019). Brazilian Sport Horse: genetic parameters for approval of Brasileiro de Hipismo stallions. Trop Anim Health Prod, 52(4), 1669-1680. https://doi.org/10.1007/s11250-019-02168-7

Publication

Tropical animal health and production
ISSN: 1573-7438
NlmUniqueID: 1277355
Country: United States
Language: English
Volume: 52
Issue: 4
Pages: 1669-1680

Researcher Affiliations

Medeiros, Bethânia Rocha
  • Departamento de Medicina Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
  • Instituto Federal Catarinense, Campus Araquari, Araquari, SC, Brazil.
Garbade, Petra
  • Departamento de Medicina Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Seixas, Luiza
  • Programa de Pós-Graduação em Ciências Animais, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Darcy Ribeiro, Asa Norte, Brasilia, DF, Brazil.
Peripolli, Vanessa
  • Instituto Federal Catarinense, Campus Araquari, Araquari, SC, Brazil. vanessa.peripolli@hotmail.com.
McManus, Concepta
  • Programa de Pós-Graduação em Ciências Animais, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Campus Darcy Ribeiro, Asa Norte, Brasilia, DF, Brazil.
  • INCT - Pecuária (MCT/CNPq/FAPEMIG), Brasilia, Brazil.
  • Instituto de Biologia, Universidade de Brasília, Campus Darcy Ribeiro, Asa Norte, Brasilia, DF, Brazil.

MeSH Terms

  • Animals
  • Brazil
  • Breeding
  • Female
  • Gait / genetics
  • Horses
  • Male
  • Phenotype
  • Quantitative Trait, Heritable

Grant Funding

  • Not applicable / Conselho Nacional de Desenvolvimento Cientu00edfico e Tecnolu00f3gico
  • Not applicable / Coordenau00e7u00e3o de Aperfeiu00e7oamento de Pessoal de Nu00edvel Superior

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Citations

This article has been cited 1 times.
  1. Ripollés-Lobo M, Perdomo-González DI, Azor PJ, Valera M. Orthopedic Diseases in the Pura Raza Española Horse: The Prevalence and Genetic Parameters of Angular Hoof Deviations. Animals (Basel) 2023 Nov 10;13(22).
    doi: 10.3390/ani13223471pubmed: 38003089google scholar: lookup
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