Effect of neonatal rib fracture repair on racing and sales performance in Thoroughbreds.

Overview

• This study examined whether Thoroughbred horses that had surgery to repair broken ribs as newborns experienced differences in their sales price or racing success compared to their maternal siblings who did not have such injuries.

Background and Objective

• Neonatal rib fractures can occur in Thoroughbred foals, and sometimes surgery is needed to repair these fractures.
• There is limited information on how this surgery affects the horses’ later outcomes, particularly their sale prices and racing performance.
• The study aimed to evaluate if surgical repair impacts these important economic and performance indicators in Thoroughbred horses.

Methods

• The study was a retrospective cohort review, covering the years 2014 to 2025.
• Medical records were obtained for Thoroughbred foals who had surgical repair of rib fractures at a referral hospital.
• Sales and racing data were gathered from publicly available databases to track outcomes such as sales prices at weanling and yearling stages, total career earnings, earnings per race start, number of race starts, and number of racing seasons.
• Each affected foal was compared with its maternal siblings to control for genetic and environmental factors.
• Statistical analysis used Wilcoxon matched-pairs signed-rank tests to compare outcomes, and results are given as median differences with interquartile ranges (IQRs).

Results

• Sixty-two foals with surgically repaired rib fractures were included in the analysis.
• When comparing these foals to their maternal siblings, no statistically significant differences were found in:
• Sale price at weanling stage (median difference $0, IQR -35,000 to 120,000).
• Sale price at yearling stage (median difference -$10,000, IQR -74,000 to 188,250).
• Total career earnings (median difference $587, IQR -43,122 to 35,880).
• Earnings per race start (median difference -$433.5, IQR -4249 to 1980).
• Number of race starts (median difference 1, IQR -10 to 8).
• Number of racing seasons (median difference 0, IQR -1 to 1).
• These findings indicate that surgical rib fracture repair did not negatively affect the horses’ economic value or racing performance.

Limitations

• The study design was retrospective, which can inherently limit control over data quality and confounding factors.
• The sample size, although moderate, might be modest for detecting smaller differences.
• There was variability in follow-up times among horses, which could influence outcomes.
• The analysis did not adjust for potential co-morbidities that could affect results.

Conclusions

• Surgical repair of neonatal rib fractures in Thoroughbred foals, when clinically necessary, does not appear to adversely impact their subsequent sales prices or racing performance compared to their maternal siblings.
• This suggests that such surgeries can be confidently recommended without concern for long-term negative economic or performance consequences.