State Vet: Selenium Overdose Likely Cause of Polo Pony Deaths

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Florida State Veterinarian Thomas J. Holt, DVM, reported today that an overdose of selenium was the probable cause of death of the 21 polo horses that collapsed prior to a competition in Wellington on April 19.

In a memorandum to Florida Agriculture and Consumer Services Commissioner Charles H. Bronson's office, Holt

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