Seegraber F J, Morrill J L
J Dairy Sci. 1979 Jun;62(6):972-7. doi: 10.3168/jds.S0022-0302(79)83356-1.
Five calves per group were fed whole milk (control) or one of three milk replacers with one-thrid of the total protein provided by a soy product. Soy products were Promocaf (a commercial soy protein concentrate), 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.
每组五头犊牛分别喂食全脂牛奶（对照组）或三种代乳品之一，其中三分之一的总蛋白由一种大豆制品提供。大豆制品分别为Promocaf（一种商业大豆浓缩蛋白）和一种实验性大豆粉。在禁食24小时后，给犊牛喂食木糖溶液。收集尿液5小时。在给予木糖后0、0.5、1、1.5、2、2.5、3、4和5小时采集颈静脉血样。在5周龄前，每周对每头犊牛进行木糖测试。在最后4周，对照组的尿木糖排泄量占所喂木糖的百分比高于喂食代乳品的组。在给予木糖5小时后采集样本的犊牛，在5周内尿木糖的平均排泄量分别为：喂食牛奶组为所喂木糖的12.4%，喂食大豆粉组为4.2%，喂食大豆浓缩蛋白组为4.2%，喂食Promocaf组为4.3%。血浆中木糖浓度峰值的平均增加量分别为55.7、44.4、42.8和45.3毫克/100毫升。在第4周和第5周时，对照组犊牛的峰值高于喂食大豆制品的犊牛。达到峰值所需的时间没有显著差异。喂食大豆制品的各组之间，血浆木糖浓度和尿木糖排泄量均无差异。
