Merck Manual

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Suggested Practices for Controlling Intestinal Parasites in Horses

Suggested Practices for Controlling Intestinal Parasites in Horses

  • Mow and harrow pastures frequently. This breaks up manure piles and exposes parasite eggs to the damaging effects of air and sun.

  • Periodically rotate pastures to other livestock (such as cattle or sheep) if possible.

  • In multiple-horse settings, group horses by age to maximize the efficiency of your deworming program and to reduce exposure to certain parasites.

  • Keep the number of horses per acre to a minimum.

  • Place hay and grain off the ground by using a feeder.

  • Remove yellowish bot eggs from horses’ coats quickly. A daily wipe-down with a warm, wet towel will stimulate the eggs to hatch, and the emerging larvae will dry out and die. Good grooming practices are necessary to remove the bot eggs, because they are firmly glued onto the hair.

  • Rotate among different classes of deworming drugs (not just different brand names) to decrease resistance.

  • Consult your veterinarian about an effective deworming program.