Parasites: Ascarids

Horses September 27, 2011 Print Friendly and PDF
Ascarids in horses


Parascaris equorum, the horse roundworm. A large yellow to white parasite (females may be up to 15 inches long). Ascarids may appear in the feces of infected horses. Adult horses can develop resistance to this parasite; thus, roundworms primarily infect young horses less than 2 years of age.

Clinical signs include: unthriftiness, potbelly, rough hair coat, and slow growth. Some young horses develop nasal discharge accompanied by a cough as a result of larvae migration.

See Ascarids in Horses for more information.

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USDA / NIFA

This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.