ヒツジの第四胃内へのデンプンとカゼインの注入が膵外分泌酵素活性に及ぼす影響

抄録

Four wethers fitted with a catheter in the common bile duct and three cannulas located in the abomasum, the duodenum, and the terminal ileum were fed alfalfa hay cubes, and then infused starch (150g/d) or starch (150g/d) plus casein (50g/d) into the abomasum for 20 days under a change over design. Compared with the pre-infusion period, abomasal starch infusion decreased pancreatic α-amylase activity, but not lipase and protease activity. Compared with starch infusion, starch plus casein infusion increased the activities of pancreatic α-amylase and lipase, but did not affect the pancreatic protease activity. Compared with starch infusion, infusion of starch plus casein decreased the glucan proportion in the α-glucoside of deal digesta, and increased the dextrin proportion. These results suggest that the proportional activity of digestive enzyme secreted from the pancreas of sheep varies regardless of a proportion of the substrate in digesta.