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Radiographic changes in Thoroughbred yearlings. Part 2: Associations with racing performance
A J Kane1, C W McIlwraith, R D Park
1Equine Orthopaedic Research Laboratory, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado 80523, USA.
Equine Veterinary Journal
|July 26, 2003
Summary
Radiographic changes in Thoroughbred yearlings can impact racing performance. Some findings, like palmar supracondylar lysis, are linked to fewer starts, while others, such as hind proximal sesamoid enthesophytes, correlate with reduced earnings.
Area of Science:
- Equine radiology
- Thoroughbred racing performance
- Veterinary diagnostics
Background:
- Radiographic examinations are common for Thoroughbred yearlings at sales.
- Limited data exist to guide veterinarians in assessing future racing potential based on radiographs.
Purpose of the Study:
- To identify specific radiographic changes in Thoroughbred yearlings.
- To associate these changes with racing performance at ages 2 and 3 years.
Main Methods:
- Analysis of radiographs from 1162 sale yearlings.
- Assessment of racing performance metrics including starts, placed percentage, and earnings.
- Correlation of radiographic findings with performance data.
Main Results:
- Yearlings with palmar supracondylar lysis, proximal sesamoid enthesophytes, or intercarpal joint disease had significantly lower odds of starting a race.
- Hind fetlock fragmentation was associated with a reduced likelihood of starting.
- Hind proximal sesamoid enthesophytes correlated with lower earnings and fewer placed starts.
Conclusions:
- While many radiographic changes do not affect performance, some are linked to reduced racing success.
- Findings should be integrated with veterinary clinical judgment.
- Some identified changes represent new concerns for Thoroughbred sale yearlings.