Effect of Soy Protein on Intestinal Absorptive Ability of Calves by the Xylose Absorption Test

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Abstract
Five calves/group were fed whole milk (control) or 1 of 3 milk replacers with 1/3 of the total protein provided by a soy product. Soy products were Promocaf (a commercial soy protein concentrate), an experimental soy protein concentrate and an experimental soy flour. After a 24 h fast, calves were fed xylose solution. Urine was collected for 5 h. Jugular blood was sampled at 0, .5, 1, 1.5, 2, 2.5, 3, 4 and 5 h after xylose administration. Xylose tests were weekly on each calf through 5 wk of age. Urinary xylose excretion, as a percentage of xylose fed, was higher in the control group during the last 4 wk than in groups fed milk replacers. Mean urinary xylose excretions during 5 wk from calves sampled 5 h after xylose administration were 12.4, 4.2, 4.2 and 4.3% of xylose administered for calves fed milk, soy flour, soy protein concentrate and Promocaf, respectively. Mean increases in peak of xylose concentration in plasma were 55.7, 44.4, 42.8 and 45.3 mg/100 ml. Peak values for control calves were higher than those for calves fed soy products at wk 4 and 5. Times required to reach peak value did not differ significantly. Neither xylose concentration of plasma nor urinary xylose excretion differed among the groups fed soy products.

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