EFFECTS OF VARIOUS LEVELS OF DIETARY CALCIUM DURING PREGNANCY ON MATERNAL CALCIUM UTILIZATION AND FETAL GROWTH IN RATS
EFFECTS OF VARIOUS LEVELS OF DIETARY CALCIUM DURING PREGNANCY ON MATERNAL CALCIUM UTILIZATION AND FETAL GROWTH IN RATS
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DOI：
10.3177/jnsv.30.285
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发表时间：
1984-01-01
影响因子：
1.6
通讯作者：
NIIYAMA, Y
中科院分区：
文献类型：
--
作者：
LAI, AC;KIYOMIITO, M;NIIYAMA, Y
通过平衡实验研究了无钙、正常钙（0.6%）和高钙（1.0%）日粮对孕鼠钙转运的影响。在妊娠期间，接受无钙、正常和高钙饮食的妊娠大鼠分别进食353、324和280 g饮食，后两组的摄食量在近期下降。无钙饮食组通过使用母鼠骨骼中再吸收的钙维持妊娠并产下正常胎儿。正常和高钙饮食大鼠妊娠前15天的钙潴留分别为116和128 mg，妊娠后6天分别为-9和-109 mg。胎仔含. apprx。130毫克的钙在足月和大部分的钙是由母鼠的骨骼，其中额外的钙保留在早期和中期怀孕。在两个饮食组中，怀孕后期钙吸收的真实速率明显低于怀孕早中期。妊娠早中期的钙潴留可能是对妊娠晚期食物消耗或钙吸收减少的生理适应。磷的吸收和平衡与饲料钙水平的关系进行了研究。
The effects of Ca-free and normal (0.6%) and high (1.0%) Ca diets on the transfer of Ca from pregnant mothers to fetuses were investigated by balance experiments. Pregnant rats receiving Ca-free, normal and high Ca diets ate 353, 324 and 280 g of the diet, respectively, during pregnancy, and the food consumption of the latter 2 groups decreased near term. The group on Ca-free diet maintained pregnancy and produce normal fetuses by using Ca resorbed from the dam''s bones. The Ca retentions due to pregnancy in rats on normal and high Ca 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 .apprx. 130 mg of Ca at term and most of this Ca was supplied from the dam''s bones, in which extra Ca were retained during early-mid pregnancy. The true rate of Ca absorption was appreciably lower during late pregnancy than during early-mid pregnancy in both dietary groups. Extra Ca retention during early-mid pregnancy seemed to be physiological adaptation to a decrease in food consumption or Ca absorption during late pregnancy. P absorption and its balance were examined in relation with the dietary Ca levels.