By Kristien Verheyen and Sarah Rosanowski
Note: This research for this article, reprinted from European Trainer, was performed over a 14-year period in Great Britain and therefore only takes into account racing over turf and all-weather surfaces, but we feel that despite not including dirt statistics, the information is thought-provoking and of interest to our North American readers, especially with the increase in turf racing particularly in the U.S.
Musculoskeletal injuries are an inherent risk of horseracing, and they are the primary cause of Thoroughbreds failing to train and race, or even retiring altogether. In addition to the evident equine welfare concerns, racehorse injuries also have economic consequences and impact on jockey safety. The industry remains committed to investigating causes of injury and associated risk factors, which can inform strategies aimed at minimizing their occurrence. Advancements in methods of identification, management, and prevention of musculoskeletal disease and injury in Thoroughbreds and improved training and racing environments to enhance the safety, health, and wellbeing of racehorses have long been strategic priorities of the Horserace Betting Levy Board (HBLB)’s veterinary research funding program in Great Britain.
In 2014, the HBLB funded a research team at the Royal Veterinary College in London to undertake a detailed study of injuries and other veterinary events occurring in flat racehorses on race day. The purpose of the project was to establish causes of fatal and non-fatal injuries occurring in British flat racing and to examine associated risk factors. The research also set out to measure heritability of common injury types and conditions, and to investigate genetic and environmental correlations between injury and race performance.
The study team had access to detailed race and performance data from all Thoroughbreds racing on the flat in Great Britain over a 14-year study period from 2000 – 2013. These were then linked to veterinary reports of injury or conditions attended to by a veterinary surgeon on race day over the same time period, provided by the British Horseracing Authority (BHA). Finally, extensive pedigree data were added to enable investigation of heritability of race day injury and genetic correlations between injury types, and between injury and performance.
The final 14-year dataset included nearly 68,000 horses making over 800,000 starts in around 77,000 flat races. The majority of races -- 67% of them -- were run on the turf, with 33% of races taking place on all-weather tracks.
Just under 8,000 veterinary events were recorded over the study period, from which an incidence of nine events per 1000 starts was calculated. The most common incidents requiring veterinary attention on the racecourse were soft tissue injuries other than tendon and ligament injuries, e.g. wounds, lacerations, or muscle strains. Unspecified lameness and respiratory conditions were also common, accounting for around a fifth of veterinary reports each. Less than 10% of veterinary events had a fatal outcome, and the overall incidence of fatality was 0.8 per 1000 starts. Although bone injury was cited in only 14% of the veterinary reports overall, they accounted for the vast majority (77%) of the fatalities.
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August - October 2018, issue 49 (PRINT)
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