{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T14:28:03Z","timestamp":1770215283584,"version":"3.49.0"},"reference-count":34,"publisher":"American Veterinary Medical Association (AVMA)","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["ajvr"],"published-print":{"date-parts":[[2000,7,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Objective<\/jats:bold>\u2014To measure pH, volatile fatty acid (VFA)\nconcentrations, and lactate concentrations in stomach\ncontents and determine number and severity of\ngastric lesions in horses fed bromegrass hay and alfalfa\nhay-grain diets.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Animals<\/jats:bold>\u2014Six 7-year-old horses.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Procedure<\/jats:bold>\u2014A gastric cannula was inserted in each\nhorse. Horses were fed each diet, using a randomized\ncrossover design. Stomach contents were collected\nimmediately after feeding and 1, 2, 3, 4, 5, 6, 7, 8, 10,\n12, and 24 hours after feeding on day 14. The pH and\nVFA and lactate concentrations were measured in gastric\njuice. Number and severity of gastric lesions were\nscored during endoscopic examinations.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Results<\/jats:bold>\u2014The alfalfa hay-grain diet caused significantly\nhigher pH in gastric juice during the first 5 hours\nafter feeding, compared with that for bromegrass hay.\nConcentrations of acetic, propionic, and isovaleric acid\nwere significantly higher in gastric juice, and number\nand severity of nonglandular squamous gastric lesions\nwere significantly lower in horses fed alfalfa hay-grain.\nValeric acid, butyric acid, and propionic acid concentrations\nand pH were useful in predicting severity of\nnonglandular squamous gastric lesions in horses fed\nalfalfa hay-grain, whereas valeric acid concentrations\nand butyric acid were useful in predicting severity of\nthose lesions in horses fed bromegrass hay.<\/jats:p>\n\t\t\t\t<jats:p>\n\t\t\t\t\t<jats:bold>Conclusions and Clinical Relevance<\/jats:bold>\u2014An alfalfa haygrain\ndiet induced significantly higher pH and VFA concentrations\nin gastric juice than did bromegrass hay.\nHowever, number and severity of nonglandular squamous\ngastric lesions were significantly lower in horses\nfed alfalfa hay-grain. An alfalfa hay-grain diet may buffer\nstomach acid in horses. 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