Ionophore Toxicity in Horses

Horses are usually exposed to ionophores by gaining access to medicated feed intended for cattle or poultry. This could be by unknowingly purchasing a product containing ionophores which is not intended for horses, or allowing ranch horses to eat with the cattle. Be sure to read all feed labels carefully. If ionophores are being fed to other animals on the property, take precautions to ensure horses cannot gain access to the feed or are not accidentally fed the medicated feed. Even exposure to poultry waste containing ionophores can cause issues with horses.