Nadeau J A, Andrews F M, Mathew A G, Argenzio R A, Blackford J T, Sohtell M, Saxton A M
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville 37901-1071, USA.
Am J Vet Res. 2000 Jul;61(7):784-90. doi: 10.2460/ajvr.2000.61.784.
To measure pH, volatile fatty acid (VFA) concentrations, and lactate concentrations in stomach contents and determine number and severity of gastric lesions in horses fed bromegrass hay and alfalfa hay-grain diets.
Six 7-year-old horses.
A gastric cannula was inserted in each horse. Horses were fed each diet, using a randomized crossover design. Stomach contents were collected immediately after feeding and 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, and 24 hours after feeding on day 14. The pH and VFA and lactate concentrations were measured in gastric juice Number and severity of gastric lesions were scored during endoscopic examinations.
The alfalfa hay-grain diet caused significantly higher pH in gastric juice during the first 5 hours after feeding, compared with that for bromegrass hay. Concentrations of acetic, propionic, and isovaleric acid were significantly higher in gastric juice, and number and severity of nonglandular squamous gastric lesions were significantly lower in horses fed alfalfa hay-grain. Valeric acid, butyric acid, and propionic acid concentrations and pH were useful in predicting severity of nonglandular squamous gastric lesions in horses fed alfalfa hay-grain, whereas valeric acid concentrations and butyric acid were useful in predicting severity of those lesions in horses fed bromegrass hay.
An alfalfa hay-grain diet induced significantly higher pH and VFA concentrations in gastric juice than did bromegrass hay. However, number and severity of nonglandular squamous gastric lesions were significantly lower in horses fed alfalfa hay-grain. An alfalfa hay-grain diet may buffer stomach acid in horses.
测量采食雀麦干草和苜蓿干草-谷物日粮马匹胃内容物的pH值、挥发性脂肪酸（VFA）浓度和乳酸浓度，并确定胃部病变的数量和严重程度。
6匹7岁的马。
每匹马均插入胃管。采用随机交叉设计给马匹饲喂每种日粮。在第14天饲喂后立即以及饲喂后1、2、3、4、5、6、7、8、10、12和24小时采集胃内容物。测量胃液中的pH值、VFA和乳酸浓度。在内镜检查期间对胃部病变的数量和严重程度进行评分。
与雀麦干草相比，苜蓿干草-谷物日粮在采食后的前5小时使胃液中的pH值显著升高。采食苜蓿干草-谷物的马匹胃液中乙酸、丙酸和异戊酸的浓度显著更高，而非腺性鳞状胃病变的数量和严重程度显著更低。戊酸、丁酸和丙酸浓度以及pH值可用于预测采食苜蓿干草-谷物马匹非腺性鳞状胃病变的严重程度，而戊酸浓度和丁酸可用于预测采食雀麦干草马匹这些病变的严重程度。
苜蓿干草-谷物日粮比雀麦干草在胃液中诱导出显著更高的pH值和VFA浓度。然而，采食苜蓿干草-谷物的马匹非腺性鳞状胃病变的数量和严重程度显著更低。苜蓿干草-谷物日粮可能会缓冲马匹的胃酸。
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