The Prevalence of Gastric Ulcers in Endurance Horses
*Source document: http://www.ncbi.nlm.nih.gov/pubmed/21592206

Insights on Equine Gastric Ulcer Syndrome
*Source document: http://apex.seraonline.org/APEXpdf/InsightsOnEGUS.pdf

Stomach Ulcers Causes and Prevention
*http://endurance101andbeyond.com/stomach-ulcers-causes-and-prevention/ 

Preventing Ulcers in Layman’s Terms
*http://enduranceridestuff.com/EquineUlcerPrevention.html

Horses Fed High Energy Diets
*Source document: http://www.slu.se/sv/institutioner/husdjurens-utfodring-vard/nyheter-huv/athletic-horses-fed-high-energy-forage-diets-/

 The American Endurance Ride Conference changed its ruling on the use of Omeprazole as a preventative under Rule 13, to allow the drug in dosages of 1 mg/ kg/per day.  This change of the rule which previously prohibited active use of Omeprazole during a sanctioned ride, opened the door for preventing ulcers in competition horses.  Consult your veterinarian concerning the treatment and prevention of equine ulcers in your performance horse.
*Source document: http://www.aerc.org  (go to Rule 13 Appendices, July 14, 2015/Appendix C/Allowed Substances.