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In Vitro and In Vivo Protein Digestion in Pigs Fed Diets Containing Soybean Protein Isolates with Different Physical Properties¹

University of Ghent, Belgium¹

Abstract

In a previous experiment, it was found that the physical properties of isolated soybean protein substituted for part of the milk protein in a diet for artificially reared piglets greatly influenced apparent N digestibility and performance. The present experiment, in which a water-soluble and an insoluble soybean protein isolate were compared, was undertaken to determine the reasons for the differences mentioned above. The results indicated that the use of a soluble soybean protein isolate, which was partly hydrolyzed, enhanced in vitro peptic and tryptic proteolysis and in vivo gastric proteolysis. In addition, the physical properties of the protein sources were important in regulating digestive physiology, as acid and pepsin secretion, measured in gastric contents sampled for 3 hr after feed intake, differed markedly between the two diets. Results are discussed in relation to the clotting behavior of the diets in the stomach and the feeding management procedures used for the artificial rearing of pigs.

¹ Thanks are extended to Purina Protein Europe for providing the isolated soybean proteins, and to C. Blomme and A. Droesbeke for technical assistance.

² Laboratorium voor Voeding en Hygiëne, Fac. Landbouwwetenschappen, R.U.G., Proefhoevestraat 10, B-9230Melle.