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Home / Equine Research Bank / J Equine Sci / A retrospective study of radiographic abnormalities in the r...
Journal of equine science2016; 27(2); 67-76; doi: 10.1294/jes.27.67

A retrospective study of radiographic abnormalities in the repositories of 2-year-old Thoroughbred in-training sales in Japan.

Abstract: This study aimed to evaluate the influence of radiographic abnormalities of 2-year-old Thoroughbred horses that were listed at in-training sales in Japan, on whether they started to race or not at 2-3 years of age. Radiographs of 850 2-year-old Thoroughbreds in the in-training sales repository from 2007 to 2010 were reviewed, and 26 categories of radiographic abnormalities were found. Forty-three horses (5.1%, 43/850) did not start a race at 2-3 years of age. In accordance with the racing results for this age category, as determined by Fisher's exact test and multiple logistic regression analysis, none of the radiographic abnormalities were significantly related to failure to start a race. At 2 years of age, 198 horses (23.3%, 198/850) did not start a race. Horses with enlargement of the proximal sesamoid bones in the fore (9 of 19 horses) and hind limbs (5 of 9 horses) did not start a race at the age of 2 years, and fewer of these horses (fore, P=0.021; hind, P=0.030) started a race at the age of 2 years compared with the population of horses without these radiographic abnormalities. These results suggest that identification of radiographic enlargement of the proximal sesamoid bones during training sales could derail the racing debut of horses at the age of 2 years. However, this might not necessarily indicate a poor prognosis and resulting in retirement from racing at 2-3 years of age.
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Publication Date: 2016-06-21 PubMed ID: 27330400PubMed Central: PMC4914399DOI: 10.1294/jes.27.67Google 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.

This is a study investigating the impact of radiographic abnormalities in 2-year-old Thoroughbred horses on their ability to start a race. It posits that certain abnormalities in the bones may influence the start of a race but may not necessarily indicate a poor prognosis leading to early retirement.

Overview of the Study

  • The study scrutinized the radiographs (X-Ray images) of 850 2-year old thoroughbred horses who were listed at in-training sales in Japan from 2007 to 2010.
  • Its aim was to establish if these radiographic abnormalities had any influence on the horses’ ability to start a race at the ages of 2 and 3.
  • A total of 26 categories of radiographic abnormalities were identified in the study.

Findings of the Study

  • The study found that 43 horses, accounting for 5.1% of the total, did not start a race at 2-3 years of age.
  • However, according to the results calculated using Fisher’s exact test and multiple logistic regression analysis, none of these abnormalities were found to be significantly related with not starting a race.
  • The study reported that when they were 2 years of age, 198 horses, or 23.3%, did not start a race.
  • The researchers discovered a correlation between horses not starting a race at the age of 2 and the presence of enlarged proximal sesamoid bones in the fore and hind limbs. Respectively, out of the horses with these abnormalities, 9 out of 19 and 5 out of 9 did not start a race at this age.
  • This presents fewer of these horses starting a race at the age of 2 years compared to those without these abnormalities.

Conclusions of the Study

  • The findings suggest that identifying radiographic enlargement of the proximal sesamoid bones during the training sales process could help predict which horses are less likely to debut in a race at the age of 2 years.
  • However, the researchers also caution that these abnormalities may not necessarily be indicative of a poor prognosis for the horse or result in early retirement from racing at ages 2-3.

Cite This Article

APA
Miyakoshi D, Senba H, Shikichi M, Maeda M, Shibata R, Misumi K. (2016). A retrospective study of radiographic abnormalities in the repositories of 2-year-old Thoroughbred in-training sales in Japan. J Equine Sci, 27(2), 67-76. https://doi.org/10.1294/jes.27.67

Publication

Journal of equine science
ISSN: 1340-3516
NlmUniqueID: 9503751
Country: Japan
Language: English
Volume: 27
Issue: 2
Pages: 67-76

Researcher Affiliations

Miyakoshi, Daisuke
  • Hidaka Horse Breeders Association, Hokkaido 056-0002, Japan.
Senba, Hiroyuki
  • The Japan Bloodhorse Breeders' Association, Hokkaido 056-0144, Japan.
Shikichi, Mitsumori
  • Hidaka Horse Breeders Association, Hokkaido 056-0002, Japan.
Maeda, Masaya
  • Hidaka Horse Breeders Association, Hokkaido 056-0002, Japan.
Shibata, Ryo
  • Hidaka Horse Breeders Association, Hokkaido 056-0002, Japan.
Misumi, Kazuhiro
  • Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan.

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