Queen Elizabeth's star horse Estimate tests positive for morphine
Queen Elizabeth II pats her horse Estimate in the winner's enclosure after it won the Gold Cup at Royal Ascot in June 2013.
CARL COURT / AFP
A racehorse owned by Britain's Queen Elizabeth II that won the prestigious Gold Cup at Royal Ascot last year has tested positive for the banned painkiller, morphine.
The British Horseracing Authority announced last week that tests on five horses under the care of various trainers showed the presence of morphine in their `A' samples.
On Tuesday, the queen's bloodstock and racing adviser, John Warren, said that the monarch's 5-year-old mare Estimate was one of the five.
Buckingham Palace said that early indications suggest that Estimate consumed the substance as a result of contaminated feed.
Warren said in a statement that Estimate's trainer, Michael Stoute "is working closely with the feed company involved to discover how the product may have become contaminated prior to delivery to his stables."