Illinois Equine Field Service
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Deworming

It has been discovered that some equine parasites are becoming resistant to commonly used dewormers, making them ineffective. It is thought that this parasite resistance is the result of overuse of certain dewormers. In an effort to minimize parasite resistance while still keeping our horses healthy, we are recommending EPG (eggs per gram) fecal testing. This test allows us to classify horses as low, moderate, or high parasite egg shedders and create a deworming schedule tailored to each horse's individual needs. In most cases, this allows us to deworm horses less frequently, thus minimizing development of parasite resistance.

The table below is a good general guide to deworming an adult horse based on its EPG fecal result. Keep in mind that differing environments (boarding stable vs home-kept, manure control and removal from turnout areas, etc.) may alter this schedule to some degree. EPG fecal testing should be performed at least annually.
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