• Korean Journal of Veterinary Research
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• v.44 no.4
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• pp.637-641
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• 2004

A variety of enteric deseases may result in the manifestation of abdominal pain in horse. An acute colic in a 5-month-old Thoroughbred filly is described. The filly was presented with acute colic characterized by rolling and pawing. Next day she suffered from severe abdominal pain and subsequently died. Post mortem examination revealed very heavy ascarid, Parascaris equorum (P. equrum) infection in cmall intestine. In addition, it is also noted the presence of P. equorum in the stomach. Infection due to P. equorummanifests itself in foals between 6-8weeks and one year of age. P. equorum is a common and ubiquitous parasite that persists for many years in stables and on pasture in spite of good hygiene and anthelmintic control programs.

• Journal of Veterinary Clinics
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• v.28 no.4
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• pp.442-445
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• 2011

Macrocyclic lactone resistance has been reported in populations of Parascaris equorum from several countries. A Grant's zebra (Equus burchelli bohmi) was admitted to the Equine Hospital at Jeju Race Park with signs of chronic weight loss and severe depression. Clinical examination revealed tachycardia and dehydration. Over the course of a day, the zebra suffered from severe abdominal pain and subsequently died. Prior to admission, the zebra had received prophylactic anthelmintic treatment with ivermectin 3 times at 3-month intervals and was dewormed with ivermectin 30 days prior to the onset of depression. At necropsy, there were masses of ascarids in the stomach and small intestine, and intestinal perforation. There are many reports of ivermectin-resistant P. equorum in horses. However, anthelmintic resistance has not been formally demonstrated in zebras. This report describes diagnosed case of gastrointestinal impaction and intestinal perforation by P. equorum in an adult zebra. We suspect that ivermectin-resistant P. equorum larvae were the cause.