Abstract
For the purpose of increasing Ca deposition and Sr excretion of animals through the variation of Ca-Sr discrimination factor in hard tissues (bone, teeth), two experiments were carried out using synthesized diet and milk added with SrCO3 in several different proportions while partly labelling by the double tracers as 45Ca and 89Sr.
As a result, the predominant discrimination of Ca over Sr was observed in femurs and incisors of rats when Sr was added to synthesized diet and milk. However, it did not appear proportionally with the amount of Sr. The variance of discrimination factor of excreta (feces and urine) was not distinct. Otherwise, the deposition of 45Ca in femurs and incisors decrea-sed when the Sr contents in diet were increased. This was almost the same with the case of 89Sr.
