Attrition of Thoroughbred and Standardbred racehorses at New York Racetracks due to exercise and non-exercise related fatalities during the 2016 - 2019 racing seasons.
Authors: Palmer Scott, Gomez Adriana M Morales, Mohammed Hussni O
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Attrition in Thoroughbred and Standardbred Racehorses Between 2016 and 2019, researchers analysed 431 racehorses (360 Thoroughbreds and 71 Standardbreds) competing at New York tracks to quantify breed-specific differences in career-ending events, examining exercise-related breakdowns, injuries, medical conditions and fatalities through longitudinal survival analysis. Thoroughbreds experienced substantially higher attrition rates—0.304 events per start compared to just 0.035 for Standardbreds—and reached median retirement age nearly three years earlier (4.2 versus 7.5 years), despite averaging only 13.6 starts versus 125.5 starts for their Standardbred counterparts. Musculoskeletal injury and medical conditions dominated attrition causes in Thoroughbreds, whereas sudden death was disproportionately common in Standardbreds, with age at first racing, the horse's age, sex (intact males at higher risk), breed and activity type all influencing attrition likelihood in multivariable modelling. These findings highlight that Thoroughbred racehorses face markedly compressed competitive careers with earlier and more frequent musculoskeletal complications, suggesting that training and conditioning protocols, racing schedules, and selection criteria warrant critical review in flat racing programmes, whilst the elevated sudden death risk in Standardbreds warrants investigation into cardiovascular and metabolic screening before competition.
Read the full abstract on PubMed
Practical Takeaways
- •Thoroughbred racehorses face dramatically higher attrition risk than Standardbreds, suggesting breed-specific management and injury prevention strategies are essential for TB racing programs
- •Early career management is critical for Thoroughbreds given median attrition age of 4.2 years; implementing conditioning protocols and screening for musculoskeletal predisposition before racing career begins may reduce losses
- •The high prevalence of musculoskeletal injuries in Thoroughbreds versus sudden death in Standardbreds indicates breed-specific monitoring priorities and potential need for different veterinary screening protocols between breeds
Key Findings
- •Thoroughbred horses had significantly higher attrition incidence per start (0.304) compared to Standardbred horses (0.035)
- •Thoroughbreds experienced median attrition age of 4.2 years versus 7.5 years for Standardbreds, with only 13.6 average starts to attrition versus 125.5 for Standardbreds
- •Musculoskeletal injuries and medical conditions were significantly more common in Thoroughbreds, while sudden death was significantly more common in Standardbreds
- •Age at first start, age of horse, intact male status, activity type, and breed all significantly affected hazard of attrition in multivariate analysis