Open standing castration in Thoroughbred racehorses in Hong Kong: Prevalence and severity of complications 30 days post-castration.
Authors: Rosanowski S M, MacEoin F, Graham R J T Y, Riggs C M
Journal: Equine veterinary journal
Summary
# Open Standing Castration in Thoroughbred Racehorses: High Complication Rates in Hong Kong Population Open standing castration remains a widely used technique for Thoroughbred racehorses, yet complication profiles vary significantly across different populations and geographical regions. Rosanowski and colleagues examined 250 horses castrated between 2007 and 2012 in Hong Kong, retrospectively grading post-operative complications over a 30-day period on a severity scale from none (N) to severe (C3), whilst also documenting bacterial cultures and antimicrobial sensitivities from infected wounds. The findings revealed that 60% of horses experienced complications, with scrotal swelling (70%), funiculitis (37%) and seroma formation (25%) being most prevalent; only eight horses (3%) required intensive treatment for severe complications, though 87% of affected horses required wound reopening and half needed extended antimicrobial or anti-inflammatory courses. Bacterial culture identified resistance to commonly used first-line antibiotics (penicillin, gentamicin, oxytetracycline and trimethoprim-sulfadiazine), though cultured organisms remained uniformly sensitive to ceftiofur and largely sensitive to enrofloxacin (76%). For equine professionals managing post-castration cases, these data support continued vigilance for wound complications and suggest that whilst most cases respond to standard interventions, the high complication prevalence warrants consideration of alternative techniques or refined post-operative protocols to reduce antimicrobial usage and associated resistance pressures in racing populations.
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Practical Takeaways
- •Expect post-castration complications in approximately 6 out of 10 horses using open standing technique in this population; plan management accordingly
- •Most complications are mild and manageable with wound reopening and antimicrobials, but cephalosporin-based protocols appear more reliable than penicillin-based regimens
- •The high complication rate warrants consideration of technique review or alternative castration methods to reduce morbidity and antimicrobial usage
Key Findings
- •60% (150/250) of Thoroughbreds experienced post-castration complications within 30 days of open standing castration
- •Scrotal swelling (70%), funiculitis (36.7%), and seroma formation (24.7%) were the most common complications
- •87.3% of affected horses required wound reopening and 50% required extended antimicrobial or anti-inflammatory courses
- •Cultured bacteria showed 100% sensitivity to ceftiofur but resistance to penicillin, gentamicin, oxytetracycline, metronidazole, and trimethoprim-sulfadiazine