Chernikov M P, Smirnova L I
Vopr Pitan. 1981 Nov-Dec(6):28-31.
A comparison was made of the efficacy of utilizing proteins that differ both in the amino acid composition and susceptibility to alimentary proteinases. Starting from 15 days of age the rats received formula feeding over a week. The formula feeding included mixtures imitating the composition of the rat's milk and containing the test proteins in an amount of 10%. It was shown that the mixture of casein with milk serum proteins was utilized most effectively. The decrease in the casein content in the diet and replacement of casein by egg albumin, bovine serum albumin or milk serum proteins were found to lead to the lowered efficacy of protein utilization. Energy distribution studies have shown that the decreased efficacy of proteins utilization is accompanied by the increased amount of nitrogen excreted with the urine.
对氨基酸组成和对消化蛋白酶敏感性均不同的蛋白质的利用功效进行了比较。从15日龄开始，大鼠接受了为期一周的配方奶喂养。配方奶喂养包括模仿大鼠母乳组成且含有10%测试蛋白质的混合物。结果表明，酪蛋白与乳清蛋白的混合物利用效率最高。研究发现，饮食中酪蛋白含量的降低以及用蛋清蛋白、牛血清白蛋白或乳清蛋白替代酪蛋白会导致蛋白质利用效率降低。能量分布研究表明，蛋白质利用效率降低伴随着尿氮排泄量增加。
