Hong Kong Racehorse Drug Positives Due to Contaminated Feed

Officials determined that zilpaterol found in tests from 12 racehorses originated from contaminated feed.

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The Hong Kong Jockey Club (HKJC) has determined that the banned substance zilpaterol found in tests taken from 12 racehorses trained by P. F. Yiu was the result of contaminated feed, and has determined that a second feed product used by trainers has similarly been contaminated.

Zilpaterol is a beta-2 agonist used to promote weight gain in livestock, but the drug is prohibited in racing. In North America, the Association of Racing Commissioners International classifies zilpaterol as a Class 3 drug with a Category A penalty.

Following the positives for horses trained by Yiu that had raced June 2 at Sha Tin Racecourse and at Happy Valley on June 5, stewards "immediately undertook an exhaustive testing regime of all products used by Mr. Yiu which may have been administered to horses trained by him."

Those tests revealed the presence of zilpaterol in feed used by Yiu and subsequent tests detected the prohibited substance in another feed used by trainers in Hong Kong. Neither feed manufacturer was identified

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Written by:

Ron Mitchell is Online Managing Editor for The Blood-Horse magazine. A Lexington native, Mitchell joined The Blood-Horse after serving in editorial capacities with The Thoroughbred Record and Thoroughbred Times, specializing in business and auction aspects of the industry, and was editor-in-chief of the award-winning Horsemen’s Journal. As online managing editor, Mitchell works closely with The Blood-Horse news editor and other departments to make sure the website content is the most thorough and accurate source for all Thoroughbred news, results, videos, and data.

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