CALGARY -- The Calgary Stampede says a post-mortem will be performed on a horse that collapsed and died following a chuckwagon race.
Stampede spokeswoman Bonni Clark says in a news release the 12-year-old thoroughbred was being ridden by an outrider during the fourth heat of the chuckwagon races Friday evening.
Clark says the horse and rider were returning to the infield when the animal collapsed.
She says a veterinarian was on the scene and determined the horse died immediately.
Clark says the horse wasn't involved in a collision and there was no obvious sign of injury.
Earlier this week, a steer at the stampede had to be euthanized due to a severe neck injury it suffered during a rodeo event.
"We acknowledge that the death of an equine athlete in a public event may be upsetting for some people," Clark said in the news release.
Outriders are part of the chuckwagon team and follow the wagon during the race to the finish line.
The stampede said the horse that died, named Hughey, was part of Doug Irvine's team and had been racing with his team for five years.
One of Irvine's horses died of a heart attack while doing training exercises at the Calgary Stampede in 2010.
Six horses died at the stampede that year. In 2011, organizers adopted new rules for rodeo events and chuckwagon races to try to provide more protection for both human and animal participants.
The death on Friday prompted the Vancouver Humane Society to reiterate its call for the stampede to suspend the chuckwagon race.
-- The Canadian Press