Categorizing Horses after Fecal Egg Counts

How do I know if my horse is a high, medium, or low shedder of parasite eggs, based on a fecal egg count?
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Q. When a fecal egg count is done for my horse (as part of a strategic deworming program), how do I know if he’s a high, medium, or low shedder of parasite eggs?

Jamie, Pennsylvania


A. Currently, for mature horses, we consider more than 500 eggs per gram a high egg count. Approximately 200 to 500 eggs per gram is a moderate egg count and less than 200 is a low egg count. These are very general categories

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Written by:

Ray M. Kaplan, DVM, PhD, Dipl. ACVIM, EVPC, is a professor of parasitology in the University of Georgia College of Veterinary Medicine’s Department of Infectious Diseases. He served on the 2013 American Association of Equine Practitioner’s Parasite Control Guidelines subcommittee.

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