Abstract
Calcium, phosphorus and magnesium metabolism during pregnancy was observed with preimigravida albino rats of Wister strain about 180g body weight fed on the basal diet.
1. The results of analysis of ash of 47 new born rats were summarized on Table 3, mean value of calcium, phosphorus and magnesium of the new borns were 14.7mg, 15.9mg and 12.3mg respectively.
2. In the late period of pregnancy, the amount of calcium retention and the calcium absorption rate not increased, and the amount of calcium retention (13, 4mg/day) was lower than that of calcium requirement (20mg/day) of fetuses. Therefore the pregnant rats themselves were in negative balances.
3. Phosphorus absorption rate was almost constant during Pregnancy. In late pregnancy, the retention was increased but the Ca/P ratio was decreased. It is regarded that phosphorus metabolism is different from that of calcium.
4. The magnesium metabolism, it resembled to that of calcium, however did not found negative balance.
