Gastric ulcers are sores or lesions on the lining (mucosa) of the stomach. Lesions usually occur on the upper portion of the stomach, an area that does not secrete an acid buffer. Ulcers in horses are cased by prolonged exposure of the unprotected region of the stomach to acid. The natural stomach defense against acid is saliva, which is produced during chewing and swallowing. In an effort to avoid gastric ulcers, horses should always be fed as much forage as possible.
