Burns R A, LeFaivre M H, Milner J A
J Nutr. 1982 Oct;112(10):1843-53. doi: 10.1093/jn/112.10.1843.
The growth of immature beagle dogs and weanling rats fed dietary protein concentrations between 0 and 20% were investigated. With lactalbumin as the protein source, 8- to 10-week-old dogs exhibited optimal growth when the diet supplied between 15 and 20% protein, whereas in older growing dogs (13-17 weeks) maximum growth and feed efficiency occurred with 11.7% dietary protein. Growth and feed efficiency of weanling rats were calculated to be optimal at 11.5% dietary protein. The protein efficiency ratio (PER) calculated during 14 days of feeding a 10% lactalbumin diet was 3.14 for 8- and 10-week-old dogs, 3.42 for 13- to 17-week-old dogs and 3.92 for weanling rats. Subsequent experiments examined the utilization of casein, soy isolate and wheat gluten by immature dogs and weanling rats. When diets contained 10% protein the adjusted PERs of casein, soy and wheat gluten were 2.50, 1.26 and -0.43 for the dog and 2.50, 1.60 and 0.34 for the rat, respectively. At 7.5% protein the adjusted PERs of casein, soy and wheat gluten were 2.50, 1.19 and -3.21 for the dog and 2.50, 1.44 and 0.29 for the rat. Thus, the rat can be a useful model for examining the quality of proteins fed to dogs. However, by using the rat one may overestimate the value of some low quality proteins.
研究了食用蛋白质含量在0%至20%之间的日粮的未成熟比格犬和断奶大鼠的生长情况。以乳白蛋白作为蛋白质来源时，8至10周龄的犬在日粮提供15%至20%的蛋白质时生长最佳，而对于年龄较大的生长犬（13至17周），日粮蛋白质含量为11.7%时生长和饲料效率最高。断奶大鼠的生长和饲料效率在日粮蛋白质含量为11.5%时计算为最佳。在喂食10%乳白蛋白日粮的14天期间计算得出的蛋白质效率比（PER），8至10周龄的犬为3.14，13至17周龄的犬为3.42，断奶大鼠为3.92。随后的实验研究了未成熟犬和断奶大鼠对酪蛋白、大豆分离蛋白和小麦面筋的利用率。当日粮含有10%的蛋白质时，犬对酪蛋白、大豆和小麦面筋的调整后PER分别为2.50、1.26和 -0.43，大鼠分别为2.50、1.60和0.34。在蛋白质含量为7.5%时，犬对酪蛋白、大豆和小麦面筋的调整后PER分别为2.50、1.19和 -3.21，大鼠分别为2.50、1.44和0.29。因此，大鼠可作为检验犬所喂食蛋白质质量的有用模型。然而，使用大鼠可能会高估一些低质量蛋白质的价值。
