Five endurance horses loaned to foreign nationals for rides in the UAE this winter have failed dope tests, with half the 2017-2018 desert season still to go.

According to listings recently updated by the FEI, there have been more three more positive findings since the two both involving Argentine visitor Daiana Chopita in December.

Uruguay’s Jonatan Rivera Iriarte, 34, is now provisionally suspended pending a FEI disciplinary hearing, after the borrowed HV Chairu tested positive to the banned substance Diisopropylamine and the controlled/specified substance Hydroxyxylazine, a sedative, when placing third in the Al Reef Cup on January 13th. Rivera Iriarte is a hugely experienced competitor who represented Uruguay at the 2016 world championships, where he finished in the leading group but was vetted out, and the 2017 Pan Am Games. He was having only his second FEI ride on the 11-year-old HV Chairu, trained by Al Reef Stables. Diisopropylamine is a Vasodilator used in the treatment of peripheral and cerebral vascular disorders.

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