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Effects of Added Dietary Sodium Polyacrylate on Passage Rate of Markers and Apparent Digestibility by Growing Swine¹

National Institute of Animal Industry, Chiba 280, Japan

Abstract

Growing pigs were used to investigate the effect of dietary addition of sodium polyacrylate (PAS) on passage of markers through the gastrointestinal tract and apparent digestibility.

A corn-soybean meal control diet and a PAS diet consisting of an addition of 5 g of PAS per kg feed to the control diet were used, fed once daily at 8:30 am. Flow rates of digesta, dry matter, nitrogen and chromic oxide in the upper jejunum were determined by a dilution technique of polyethylene glycol with four pigs, each fitted with two T-piece cannulas in the upper jejunum. Retention times in the whole intestine were determined by introducing stained straw into the upper jejunum cannula and counting the coloured straw particles in feces collected at 3-hr intervals for 4 days. Apparent digestibilities were determined with 16 pigs by the chromic oxide indicator method.

The total passage of nitrogen and chromic oxide 9.5 hr after feeding in pigs fed the PAS diet was lower (nitrogen, P<.05; chromic oxide, P<.01) than that in the pigs fed the control diet. Mean retention time of chromic oxide in the stomach and duodenum for the PAS diet was estimated to be 8.8 hr, which was higher (P<.05) than that for the control diet, 3.8 hours.

Mean retention time of stained straw in the whole intestine was approximately 60 hr, and no significant difference was observed between the diets.

Apparent digestibility tended to increase with addition of PAS and these trends were significant (P<.01) regarding crude protein and ash.

¹ The authors with to express their appreciation to Mrs. F. Usui for assistance in the surgical operation, and to Mr. M. Itoh for his help in calculations of retention time.

² Department of Nutrition.

³ Present address: Nippon Kayaku Co., Ltd., Takasaki 370-12, Japan.