Jenny called her veterinary care provider with an emergency: The foals in her stable showed no interest in their morning feed, and many were depressed and inactive. When the veterinary technician asked whether there had been any changes in the stablerecently, Jenny stated that a new shipment of feed had been brought in the previous morning. The technician immediately suspected ionophore toxicity. Subsequent laboratory testing of stomach contents confirmed significant ionophore toxicosis from improperly mixed feed.
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