A cross-sectional study of colic in horses on thoroughbred training premises in the British Isles in 1997.
Authors: Hillyer M H, Taylor F G, French N P
Journal: Equine veterinary journal
Summary
# Editorial Summary: Colic Incidence in British Thoroughbred Training Yards (Hillyer et al., 2001) Hillyer and colleagues conducted a postal survey across British Isles Thoroughbred training premises in 1997 to establish baseline colic rates and identify management risk factors—important given the substantial economic and welfare impact of colic in racing populations. The study captured 7.19 colic episodes per 100 horse-years, with an overall case fatality rate of 6.2%, though the majority of cases (63.1%) resolved with medical intervention alone. Notably, Flat racing yards showed higher single-episode colic rates whilst National Hunt premises experienced more recurrent cases, with seasonal clustering evident in spring and autumn across both disciplines. Larger premises paradoxically demonstrated lower colic risk after adjustment for herd size, and management factors such as sole ownership/responsibility and combined training-breeding operations were protective—suggesting that consistent, hands-on oversight and diversified facility use may reduce incidence. For practitioners, these findings underscore the importance of systematic monitoring during peak seasons, the value of owner engagement in daily health surveillance, and the possibility that stable management consistency influences colic susceptibility independent of facility size or discipline.
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Practical Takeaways
- •Expect colic to occur in approximately 1 in 17 horses annually on Thoroughbred training premises, with higher mortality (6.2%) than commonly assumed, requiring robust management protocols
- •Implement targeted management strategies during spring and autumn peaks, with different risk profiles between Flat and National Hunt operations requiring discipline-specific approaches
- •Larger premises demonstrate protective effects against colic incidence—consider consolidation benefits or shared management practices; combined training/breeding and owner-managed facilities show protective patterns worth investigating for best practice
Key Findings
- •Colic incidence density was 7.19 per 100 horse years with cumulative incidence of 5.80% in Thoroughbred training premises
- •Overall mortality from colic was 0.45 deaths per 100 horse years, with 63.1% requiring medical treatment and 2.0% requiring surgery
- •Seasonal pattern showed spring and autumn peaks with significant differences between Flat and National Hunt premises
- •Larger premises had decreased colic risk; Flat premises had increased risk, while combined training/breeding establishments and owner-managed premises had decreased risk