Lin C P, Huang P C
J Nutr. 1982 Jun;112(6):1067-74. doi: 10.1093/jn/112.6.1067.
Comparison between the positive N balance data and the actual N deposition in the same adult animals was made. In experiment 1, 24 mature 9-month old male rats were divided into three groups. One group was killed on day zero and served as the control. The two other groups were fed 25 or 49% casein diet for 8 weeks. Body weight was kept relatively constant by regulating the dietary intake. The N balance study (including body hair N loss) was conducted thrice intermittently, and body N was determined at the end of the experiment. It was found that the mean total-body N of the 49% casein groups was 967 mg higher than the 25% casein groups and 885 mg higher than the day-zero control group (P less than 0.01). The calculated N retention during the experimental period was 1876 mg for the 49% casein group. In experiment 2, a similar study was conducted except that the 25 and 49% casein diets were fed ad libitum, and body weight gain was allowed. The total-body N values of both test groups at the end of the feeding period were very close to each other, but significantly higher than that of the day-zero control group (P less than 0.01).
对相同成年动物的正氮平衡数据与实际氮沉积进行了比较。在实验1中，将24只9个月大的成熟雄性大鼠分为三组。一组在第0天处死作为对照。另外两组分别喂食25%或49%酪蛋白饮食8周。通过调节饮食摄入量使体重保持相对恒定。间歇进行了三次氮平衡研究（包括体毛氮损失），并在实验结束时测定了体氮。发现49%酪蛋白组的平均全身氮比25%酪蛋白组高967mg，比第0天的对照组高885mg（P<0.01）。49%酪蛋白组在实验期间计算出的氮潴留量为1876mg。在实验2中，进行了类似的研究，不同之处在于25%和49%酪蛋白饮食为自由采食，并允许体重增加。喂食期结束时两个测试组的全身氮值彼此非常接近，但显著高于第0天的对照组（P<0.01）。
