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Journal of Dairy Science Vol. 79 No. 3 475-482
© 1996 by American Dairy Science Association ®
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Analytical Criteria for Predicting Apparent Digestibility of Soybean Protein in Preruminant Calves

J. P. Lalles 1, H. M. Tukur 1, R. Toullec 1, and B. G. Miller 2

1 Institut National de la Recherche Agronomique, Laboratoire du Jeune Ruminant, 65, rue de Saint-Brieuc, 35042 Rennes Cedex, France
2 University of Bristol, Department of Clinical Veterinary Science, Langford House, Langford, Bristol BS18 7DU, United Kingdom

A series of experiments on the use of soybean as a protein source in milk replacers for veal calves was undertaken to determine the relationships between the physicochemical and antinutritional properties and apparent digestibilities of nine soybean products. Soybean provided between 58 and 71% of dietary CP, and skim milk or whey powder provided the remainder. Soybean products were analyzed for CP, native protein, aggregated protein, carbohydrate-linked protein, peptides, antitryptic activity, and immunoreactivity of lectin, glycinin, alpha-conglycinin, and ß-conglycinin. The apparent digestibility of N calculated for soybean protein varied between 59 and 84%. Simple linear correlations were significant between apparent digestibility of soybean N and concentrations of native protein, antitryptic activity, glycinin, alpha-conglycinin, and ß-conglycinin. However, only variation in antitryptic activity, alpha-conglycinin, and ß-conglycinin contributed significantly to an explanation for the variation in apparent digestibility of soybean N in a multiple linear equation. Under our experimental conditions, ß-conglycinin was the best predictor of digestibility of soybean N. Antitryptic activity became the best predictor when soybean products had no detectable ß-conglycinin.

Key Words: antinutritional factors • calf • protein digestibility • soybean

Submitted on January 4, 1995
Accepted on October 27, 1995




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L. Montagne, I. Crevieu-Gabriel, R. Toullec, and J. P. Lalles
Influence of Dietary Protein Level and Source on the Course of Protein Digestion Along the Small Intestine of the Veal Calf
J Dairy Sci, March 1, 2003; 86(3): 934 - 943.
[Abstract] [Full Text] [PDF]


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Copyright © 1996 by the American Dairy Science Association ®.