Analytical Criteria for Predicting Apparent Digestibility of Soybean Protein in Preruminant Calves

• Published in: Journal of dairy science Vol. 79; no. 3; pp. 475 - 482
• Main Authors: Lalles, J.P., Tukur, H.M., Toullec, R., Miller, B.G.
• Format: Journal Article
• Language: English
• Published: Savoy, IL Elsevier Inc 01.03.1996; Am Dairy Sci Assoc; American Dairy Science Association
• Subjects: ACTIVIDAD ENZIMATICA; ACTIVITE ENZYMATIQUE; Agricultural sciences; ALIMENT D'ALLAITEMENT; Animal Nutritional Physiological Phenomena; Animal productions; Animals; Antigens, Plant; antinutritional factors; Biological and medical sciences; calf; Cattle - growth & development; Cattle - physiology; Chemical Phenomena; Chemistry, Physical; CONTENIDO DE NITROGENO; Dietary Proteins - metabolism; DIGESTIBILIDAD; DIGESTIBILITE; Digestion; Fundamental and applied biological sciences. Psychology; Globulins - metabolism; Hot Temperature; INHIBIDORES DE ENZIMAS; INHIBITEUR D'ENZYME; LECTINAS; LECTINE; Life Sciences; Nitrogen - metabolism; PESO MOLECULAR; POIDS MOLECULAIRE; protein digestibility; PROTEINAS VEGETALES; PROTEINE VEGETALE; Rumen - physiology; Seed Storage Proteins; SOJA; soybean; Soybean Proteins; SUSTITUTOS DE LA LECHE; TECHNIQUE DE PREVISION; TECNICAS DE PREDICCION; TENEUR EN AZOTE; TERNERO; Terrestrial animal productions; TRIPSINA; TRYPSINE; VEAU; Vegetable Proteins - chemistry; Vegetable Proteins - metabolism; Vertebrates; soybean; ADSN; NP; CLP; TUI; WEPC; antinutritional factors; AP; protein digestibility; TF; RF; WETC; calf; KSTI; Farming animal; Ruminant animal; Animal feeding; Calf; Ox; Vertebrata; Mammalia; Antinutrient factor; Milk replacer; Artiodactyla; Ungulata; Physicochemical properties; Digestibility; Soybean meal; VEAU PRERUMINANT
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.S0022-0302(96)76388-9

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, α-conglycinin, and β-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, α-conglycinin, and β-conglycinin. However, only variation in antitryptic activity, α-conglycinin, and β-conglycinin contributed significantly to an explanation for the variation in apparent digestibility of soybean N in a multiple linear equation. Under our experimental conditions, β-conglycinin was the best predictor of digestibility of soybean N. Antitryptic activity became the best predictor when soybean products had no detectable β-conglycinin.