CHRB Eyes Lower Phenylbutazone Threshold

Lower thresholds for the common pain reliever phenylbutazone (Bute) in post-race tests of horses could be on the way in California in spite of objections from horsemen. At its meeting Feb. 17 at Santa Anita Park in Arcadia, Calif., the California Horse Racing Board (CHRB) approved a 45-day comment period for a rule change that would reduce the permitted level of phenylbutazone from five micrograms

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