J. Anim Sci.
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J. Anim Sci. 1981. 53:1011-1018.
© 1981 American Society of Animal Science
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Influence of the Partial Replacement of Milk Protein by Soybean Protein Isolates with Different Physical Properties on the Performance and Nitrogen Digestibility of Early-Weaned Pigs1

J. A. Decuypere, A. Meeusen and H. K. Henderickx

Univeristy of Ghent, Belgium2

Abstract

The importance of the relative partitition of "soluble" whey protein and immobilized clot protein in milk replacers for piglets was studied. About 40% of the milk protein in an all-milk diet (MA diet) was replaced with three types of isolated soy protein with different physical properties. One was totally soluble in water (diet W+), the second was easily dispersed in water (diet C+) and the third was totally insoluble (Diet W–). Performance and apparent N digestibility were studied in artificially reared piglets from 12 to 40 days of age. Performance (daily gain and feed efficiency) differed only in the fourth experimental week, when the piglets on diets W+ and C+ performed markedly better than those on diet W–. The reference diet (MA) produced intermediate results. The best apparent N digestibility throughout the experiment was obtained with diets W+ and MA (94,9 and 93.5%). The apparent N digestibility was lowest with diet W–, while diet C+ gave intermediate results. The apparent N digestibility coefficients for the last two diets, however, increased with age (86.4 to 91.9% and 89.9 to 94.6%, respectively). Results are discussed in relation to the nutrient content of the diets, clot properties, relative partitition of clot and whey quantities and origin and nature of the protein.

Footnotes

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

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






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Copyright © 1981 by the American Society of Animal Science.