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Dietary Pectin's Effect on Ileal and Fecal Amino Acid Digestibility and Exocrine Pancreatic Secretions in Growing Pigs^{1, 2, 3,}

University of Alberta, Department of Animal Science, Faculty of Agriculture and Forestry, Edmonton, Alberta, Canada T6G 2P5 ^* I.S. Research Institute Animal Physiology and Animal Nutrition, D-23812 Wahlstedt, Germany

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 -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.

KEY WORDS: • pigs • pectin • fermentation • pancreatic secretion • amino acid digestibility

¹ Presented in part at the 42nd Annual Meeting of the German Nutrition Society, March 1988, Göttingen, Germany [Mosenthin, R., Sauer, W. C. & Maenhout, F. (1988). Einfluß von Futtermittelzusammensetzung und Fütterungsfrequenz auf die exokrine Pankreassekretion bei Schweinen. J. Anim. Physiol. Anim. Nutr. 60: 42–43].

² Financial support was provided by the Natural Sciences and Engineering Research Council of Canada and a postdoctoral fellowship of the German Research Society (DFG).

³ The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

⁴ To whom correspondence and reprint requests should be addressed.

Manuscript received 7 July 1993. Revision accepted 21 February 1994.

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