Mosenthin R, Sauer W C, Ahrens F
University of Alberta, Department of Animal Science, Faculty of Agriculture and Forestry, Edmonton, Canada.
J Nutr. 1994 Aug;124(8):1222-9. doi: 10.1093/jn/124.8.1222.
The effect of dietary pectin on apparent ileal and fecal digestibilities of protein and amino acids and on pancreatic secretions was studied in two experiments with growing pigs (initial weight 70 kg). Four barrows were fitted with simple T-cannulas for collection of ileal digesta; another four barrows were fitted with permanent re-entrant cannulas for collection, sampling and subsequent return of pancreatic juice. Dietary pectin included at a level of 7.5 g/100 g in a cornstarch-based diet significantly depressed apparent ileal and fecal protein and amino acid digestibilities. This depression in the small intestine could be attributed to both an increase in endogenous protein secretions and a decrease in the efficiency of digestion. In the large intestine, pectin was used by intestinal microbes as the principal energy source to catabolize nitrogenous compounds and to stimulate bacterial nitrogen assimilation, thus altering the amino acid profile of protein voided in feces. The inclusion of pectin did not affect the flow of pancreatic juice or the total secretion of protein, lipase, trypsin and chymotrypsin. However, there was a significantly lower secretion of alpha-amylase, which was a direct result of the replacement of starch by pectin. The results demonstrate that pectin may have a detrimental effect on the processes of protein digestion and absorption but does not affect the secretion of pancreatic proteolytic enzymes in pigs.
在两项针对生长猪（初始体重70千克）的试验中，研究了日粮果胶对蛋白质和氨基酸的回肠表观消化率、粪便消化率以及胰腺分泌的影响。四头公猪安装了简单的T型套管以收集回肠食糜；另外四头公猪安装了永久性再入式套管，用于收集、采样和随后返回胰液。在以玉米淀粉为基础的日粮中添加7.5克/100克水平的果胶，显著降低了回肠表观和粪便蛋白质及氨基酸消化率。小肠中的这种降低可归因于内源性蛋白质分泌增加和消化效率降低。在大肠中，果胶被肠道微生物用作主要能量来源，以分解含氮化合物并刺激细菌氮同化，从而改变粪便中排出蛋白质的氨基酸组成。添加果胶不影响胰液流量或蛋白质、脂肪酶、胰蛋白酶和糜蛋白酶的总分泌量。然而，α-淀粉酶的分泌量显著降低，这是果胶替代淀粉的直接结果。结果表明，果胶可能对猪的蛋白质消化和吸收过程有不利影响，但不影响胰腺蛋白水解酶的分泌。
