Cohen L R, Woodside B C
Psychology Department, Concordia University, Montreal, Quebec, Canada.
Appetite. 1989 Apr;12(2):119-36. doi: 10.1016/0195-6663(89)90101-3.
Protein self-selection was investigated in female rats throughout pregnancy and lactation. In the first experiment, impregnated rats were presented with either a choice between low and high protein (casein) diets, or standard lab chow and their protein intake was compared to that of non-impregnated controls. Impregnated females showed an increase in both absolute and relative protein intake at the end of pregnancy and during the second week of lactation when compared to both their own baseline intake and that of non-impregnated rats. In the second experiment, lactating rats and non-lactating controls were presented with a choice between low and high protein (casein) diets, a high protein (soybean meal) and a high carbohydrate diet, or lab chow. Lactating rats consumed more protein than non-lactating rats regardless of diet condition, but percentage protein intake was found to differ across diet choice conditions. Differences in diet fraction choice are discussed in terms of protein: carbohydrate ratios, and how different sources of protein might be utilized differently within the body.
在整个怀孕和哺乳期对雌性大鼠的蛋白质自我选择进行了研究。在第一个实验中，给受孕大鼠提供低蛋白和高蛋白（酪蛋白）饮食之间的选择，或者标准实验室饲料，然后将它们的蛋白质摄入量与未受孕对照组进行比较。与它们自己的基线摄入量以及未受孕大鼠相比，受孕雌性大鼠在怀孕末期和哺乳期第二周时，绝对蛋白质摄入量和相对蛋白质摄入量均有所增加。在第二个实验中，给哺乳大鼠和非哺乳对照组提供低蛋白和高蛋白（酪蛋白）饮食、高蛋白（豆粕）和高碳水化合物饮食或实验室饲料之间的选择。无论饮食条件如何，哺乳大鼠比非哺乳大鼠消耗更多的蛋白质，但发现蛋白质摄入量百分比在不同的饮食选择条件下存在差异。从蛋白质与碳水化合物的比例，以及体内不同蛋白质来源可能如何被不同利用的角度讨论了饮食成分选择的差异。
