title: The prevalence and distribution of gastric ulceration in 345 racehorses.
abstract: OBJECTIVE
  To report the prevalence and distribution of gastric ulceration within a group of racehorses and to describe the endoscopic appearance of gastric antrum and pyloric ulceration.
  
  
  METHODS
  Retrospective clinical study.
  
  
  METHODS
  Medical records from gastroscopic examinations of 345 racehorses (331 Thoroughbreds and 14 Standardbreds) were reviewed. Prevalence, distribution and severity of gastric ulcers were recorded. Lesions involving the squamous mucosa and the glandular mucosa of the antrum and pylorus were graded and compared.
  
  
  RESULTS
  Gastric ulceration was found in 86% of racehorses. The squamous mucosa around the margo plicatus was most commonly affected. The pylorus was examined in 175 horses and 47% were ulcerated. No association was found between presence of lesions of the squamous mucosa and those of the pylorus. Low correlation was found between grade and location of lesions, with the pyloric lesion score being significantly less than the squamous mucosal lesion score.
  
  
  CONCLUSIONS
  Gastric ulceration was present in a large proportion of racehorses. The pylorus was also an important site of ulceration. There was no association between presence of lesion at one site and the other, although there was a low correlation between grade of lesion and location, with the pyloric ulcer grade being lower.
authors.affiliation: Randwick Equine Centre, 3 Jane Street, Randwick, New South Wales 2031.
authors.forename: L M
authors.initials: LM
authors.lastname: Begg
authors.forename: C B
authors.initials: CB
authors.lastname: O'Sullivan
mesh_terms: D000818:Animals; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology; D006734:Horse Diseases / Q000453:epidemiology* / Q000473:pathology; D006736:Horses; D008297:Male; D009517:New South Wales / Q000453:epidemiology; D015995:Prevalence; D011708:Pylorus / Q000473:pathology; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013276:Stomach Ulcer / Q000453:epidemiology / Q000473:pathology / Q000662:veterinary*