"It is fairly commonly used at the racetrack," the report said. "However, the blanket prescribing of thyroxine to all horses in Baffert's barn does appear unusual. In a sense, the medication was treated more as a supplement than a medication.
Thyroxine is most commonly used by veterinarians to assist weight loss in overweight horses, especially when they come in from the farm."
Because all of Baffert's horses received the medication, its use "does not explain why all the fatalities occurred at Hollywood Park," said the report. Arthur noted that Baffert conducted an internal review of his supplement program and discontinued the use of thyroxine in April.
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