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Equine veterinary journal2007; 38(7); 616-621; doi: 10.2746/042516406x150394

Variation in conformation in a cohort of National Hunt racehorses.

Abstract: Assessment of conformation is commonly used in the selection of horses for performance purposes. Little information is available on the normal range of conformational traits within the Thoroughbred population. Objective: To describe variations in conformation in a cohort of racing Thoroughbreds in order to provide a set of baseline standards within which conformational traits can be considered normal. Methods: Ninety-eight conformational parameters were measured in a cohort of 108 National Hunt racehorses using a digital motion analysis system. The measurements consisted of segment lengths, joint angles in 2D and 3D, inclinations, deviations and circumference measurements. The differences between left and right sides were determined to obtain a measure of asymmetry. Conformational parameters were related to each horse's country of origin, preferred race distance and race type. Results: The majority of parameters followed a normal distribution with the biggest relative variation in hoof related measurements and in stifle and coxal angle. All circumference measurements and the majority of the length measurements were significantly correlated with the height of the horse at the withers. No underlying pattern of combinations of conformational parameters was identified. Twenty-five per cent of the parameters showed a significant difference between left and right-sided measurements. A significant difference in girth and intermandibular width was observed between Irish and French horses. Conclusions: Thoroughbreds differ from other breeds, not only with regard to segment lengths but also with regard to joint angles and deviations. Variation in conformational parameters was relatively small and no distinct pattern of combinations of conformational traits identified. Conclusions: The variation in conformational measurements in Thoroughbred racehorses establishes a set of baseline measurements of conformational range against which individual horses can be assessed.
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Publication Date: 2007-01-19 PubMed ID: 17228575DOI: 10.2746/042516406x150394Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

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.

This study analyzed different physical characteristics (like joint angles, segment lengths, and hoof sizes) in National Hunt racehorses to create a set of standards for what is considered normal body structure within the Thoroughbred breed. The team found variation in these characteristics, with interesting differences based on the horse’s origin and racing style, but no clear pattern linking specific traits.

Research Methodology

  • The researchers studied 108 National Hunt racehorses and used a digital motion analysis system to measure 98 different aspects of their physical structure. These measurements included lengths of different body parts, angles of joints, as well as lengths and circumferences of various body sections.
  • They also looked at any differences between the left and right side of the horse’s body to analyze symmetry.
  • Finally, they examined whether there were any patterns in these measurements related to the horse’s country of origin, preferred race distance and race type.

Results and Findings

  • The study found that the most significant variation in measurements related to hooves and the angles of the stifle and coxal (hip) joints.
  • Overall, the majority of parameters followed a normal distribution, indicating a natural variation in physical features within the breed.
  • Significant correlations were observed between the height of the horse at the withers (the highest part of the back) and all circumference measurements and most length measurements.
  • Interestingly, 25% of parameters showed a significant difference between the horse’s left and right-sided measurements, indicating some level of asymmetry in these animals.
  • In comparing horses from different countries, they noticed a substantial difference in girth and intermandibular width (distance between the jaws) between Irish and French horses.

Conclusion

  • The study showed that Thoroughbreds differ not only in body lengths but also joint angles and deviations when compared to other breeds.
  • Although there was variation in physical measurements, no distinctive pattern was found linking specific conformational traits.
  • This research provides a baseline set of measurements that can be used to assess individual Thoroughbreds’ conformation or physical structure.

Cite This Article

APA
Weller R, Pfau T, May SA, Wilson AM. (2007). Variation in conformation in a cohort of National Hunt racehorses. Equine Vet J, 38(7), 616-621. https://doi.org/10.2746/042516406x150394

Publication

Equine veterinary journal
ISSN: 0425-1644
NlmUniqueID: 0173320
Country: United States
Language: English
Volume: 38
Issue: 7
Pages: 616-621

Researcher Affiliations

Weller, R
  • Department of Veterinary Clinical Sciences, The Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA, UK.
Pfau, T
    May, S A
      Wilson, A M

        MeSH Terms

        • Animals
        • Biomechanical Phenomena
        • Cohort Studies
        • Female
        • Horses / anatomy & histology
        • Horses / physiology
        • Imaging, Three-Dimensional / veterinary
        • Male
        • Pedigree
        • Physical Conditioning, Animal / physiology
        • Range of Motion, Articular / physiology
        • Running / physiology
        • Sports

        Citations

        This article has been cited 5 times.
        1. Oheida AH, Shalgum AA, Alrtib AM, Booker AO, Ben-Naser KM, Davies HMS. Variation in palmaromedial articulations of carpometacarpal joints in Thoroughbred and Standardbred racehorses. Open Vet J 2023 May;13(5):569-575.
          doi: 10.5455/OVJ.2023.v13.i5.9pubmed: 37304598google scholar: lookup
        2. Gmel AI, Druml T, Portele K, von Niederhäusern R, Neuditschko M. Repeatability, reproducibility and consistency of horse shape data and its association with linearly described conformation traits in Franches-Montagnes stallions. PLoS One 2018;13(8):e0202931.
          doi: 10.1371/journal.pone.0202931pubmed: 30148872google scholar: lookup
        3. Tozaki T, Sato F, Ishimaru M, Kikuchi M, Kakoi H, Hirota KI, Nagata SI. Sequence variants of BIEC2-808543 near LCORL are associated with body composition in Thoroughbreds under training. J Equine Sci 2016;27(3):107-114.
          doi: 10.1294/jes.27.107pubmed: 27703405google scholar: lookup
        4. Stachurska A, Wnuk E, Łuszczyński J, Donderowicz W. Preliminary Biometric Study on Symmetry of Hoof Solear Aspect in Forelimbs in Four Horse Breeds. Animals (Basel) 2025 Nov 21;15(23).
          doi: 10.3390/ani15233369pubmed: 41375428google scholar: lookup
        5. Haussler KK, le Jeune SS, MacKechnie-Guire R, Latif SN, Clayton HM. The Challenge of Defining Laterality in Horses: Is It Laterality or Just Asymmetry?. Animals (Basel) 2025 Jan 21;15(3).
          doi: 10.3390/ani15030288pubmed: 39943060google scholar: lookup
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