期刊名称：Journal of Nutritional Science and Vitaminology
印刷版ISSN：0301-4800
电子版ISSN：1881-7742
出版年度：1984
卷号：30
期号：3
页码：285-295
DOI：10.3177/jnsv.30.285
出版社：Center for Academic Publications Japan
摘要：The effects of calcium-free and normal (0.6%) and high (1.0%) calcium diets on the transfer of calcium from pregnant mothers to fetuses were investigated by balance experiments. Pregnant rats receiving calcium-free, normal and high calcium diets ate totals of 353, 324 and 280 g of the diet, respectively, during pregnancy, and the food consumption of the latter two groups decreased near term. The group on calcium-free diet was able to maintain pregnancy and produce normal fetuses by using calcium resorbed from the dam's bones. The calcium retentions due to pregnancy in rats on normal and high calcium diets were 116 and 128 mg, respectively, during the first 15 days, and -9 and -109 mg, respectively, during the last 6 days of pregnancy. Fetuses contained about 130 mg of calcium at term and most of this calcium was supplied from the dam's bones, in which extra calcium were retained during early-mid pregnancy. Unexpectedly, the true rate of calcium absorption was appreciably lower during late pregnancy than during early-mid pregnancy in both dietary groups. Thus, extra calcium retention during early-mid pregnancy seemed to be physiological adaptation to a decrease in either food consumption or calcium absorption during late pregnancy. Phosphorus absorption and its balance were examined in relation with the dietary calcium levels.
