Effect of dietary Calcium source to improvement of bone metabolism.

乳清Ca对去卵巢骨质疏松模型大鼠骨代谢的影响在本研究中，我们比较了乳清作为钙源的生物利用度，并与CaCO_3和cahpo_4.5周的雌性大鼠去卵巢后，饲喂低钙饲料（Ca:0.01%） 27天。然后将这些大鼠分为乳清、CaCO_3和CaHPO_4三组。他们估计钙平衡，微密度测定和骨折性能。结果表明，3组间血清钙水平、食物效率和增重均无显著差异。乳清钙饲粮组尿钙排泄量高于CaCO_3和CaHPO_4饲粮组。乳清和CaHPO_4饲粮组股骨断裂性能和微密度测量参数SIGMA GS、SIGMA GS/D、GSmin、GSmax均高于CaCO_3饲粮组。乳清饲粮组的各项指标略高于CaHPO_4饲粮组（差异不显著）。这些结果清楚地表明，乳清作为钙的来源，对增加骨骼强度有有益的作用。

Effects of Whey Ca on Bone Metabolism in Ovariectomized Osteoporosis Model RatsIn this study, we investigated the bioavailability of whey in diet as a Ca source, compared to CaCO_3 and CaHPO_4.5-weeks-female rats were ovariecotomized, and then they were fed on the low Ca diet(Ca:0.01%) for 27days. After that, these rats were divided into three groups, whey, CaCO_3 and CaHPO_4. They were estimated Ca balance, microdensitometry and breaking properties of bone. As a result, there were no significant differences in serum Ca levels, food efficiency ratio and body weight gain between those three groups. On the other hand, in whey Ca diet group, the urinary Ca excretion is higher than that of CaCO_3 and CaHPO_4 diet groups. And in whey and CaHPO_4 diet groups, the femur breaking properties and the parameters of micro densitometry, SIGMA GS, SIGMA GS/D, GSmin, GSmax, increased compared to CaCO_3 diet group. And those parameters of whey diet group were a little higher than that of CaHPO_4 diet group (not significant). These results clearly suggest that the whey, as a Ca source, has a beneficial effect on increasing bone strength.