State Vet: Selenium Overdose Likely Cause of Polo Pony Deaths

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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