Horse Deaths Related to Endurance Rides
The following is an except from recent article by by Nancy S. Loving, DVM for thehorse.com.
“Endurance” is an aptly named riding discipline. The sport requires horse and rider to complete more than 50 to 100 miles of trail in a single day. Depending on the competition type, terrain, and climatic conditions, horses might be actively working anywhere from six to 24 hours. Because of the nature of the sport,dehydration, electrolyte imbalances, and heat stress can arise, sometimes leading to fatalities.
To investigate causes of fatality in endurance horses, Olin Balch, DVM, MS, PhD, of North Fork Veterinary Service, in Cascade, Idaho, and Hal Schott II, DVM, PhD, Dipl. ACVIM, professor of large animal medicine at Michigan State University, reviewed 13 years of endurance ride veterinary reports. Schott presented their findings at the 2015 American Association of Equine Practitioners Convention, held Dec. 5-9 in Las Vegas.
For their study, Balch and Schott compiled results from American Endurance Ride Conference post-ride surveys and veterinary reports from 2002-2014. During this time there were 96 fatalities out of 270,070 horses entered in endurance competitions—that’s 0.32 fatalities per 1,000 starts. Of the fatalities, 69 were euthanized and 27 died. Eighty-seven had participated in the ride, while nine others died or were euthanized due to injuries sustained by escape from an enclosure, kick injury, or colic unassociated with the demands of endurance exercise. There were no differences among sex or age and the number of fatalities did not differ over the years studied. Although there were no statistically significant regional differences, the Southwest had more fatalities than the West, which had more than the Mountain region, which had more than the Northeast.
“Despite veterinary oversight, which is arguably the highest of any equestrian sport during competition, fatalities do occur,” remarked Schott, who presented their findings. During endurance rides, horses must stop at mandatory rest points for examination by a ride veterinarian to determine that they are “fit to continue.” At the finish line exam, horses must again be examined and deemed fit to continue in order to receive a completion and placing.
Balch and Schott’s study included all fatalities that occurred over the four-day period from check-in the day before the race to two days following the competition. If a problem developed at the ride, then they investigated that horse’s outcome beyond those four days. “An increase in ride distance often leads to gastrointestinal problems and metabolic compromise,” Schott explained.
They determined that 26 deaths (30%) in competing horses were not fatigue-related. These resulted from falls, catastrophic injury, gastrointestinal disorders, or sudden death, and one horse was lost and later found dead. There were 61 fatalities (70%) attributed to the demands of endurance exercise, including consequences of severe muscle cramping and exhaustion.
“Exhaustion was commonly associated with decreased intestinal function due to a long period of decreased blood flow to the intestinal tract, as blood was diverted to the exercising muscles during exercise,” Schott explained. “Affected horses showed a poor appetite and colic signs, attributable to ileus (poor intestinal motility). A disastrous consequence was stomach rupture in several horses, with no apparent relation to stomach ulcers, while others developed renal failure and/or laminitis.”
Another important finding, he said, was that 20 of these 61 horses actually finished the ride and received completion awards, yet developed signs of exhaustion after the ride with fatalities developing over the next couple of days.
“This finding emphasizes that riders must monitor their horses closely after the ride and seek veterinary attention when any concern over recovery arises,” he said.
“Finally, it warrants mention that owners of 19 horses that ultimately died or were euthanized declined fluid therapy and/or referral to a hospital for further care when recommended by veterinarians at the ride site,” Schott added.