axount of strontius as you increase the caloium intake (and this has been dene with radioactive strontiwa). ‘The strentdum goes down until you reach a certain point of calctum intake then this curve levels off, then the addition of further caloium dees not cut dow the deposition of strontium. 2 think this is a single dese experiment which doeam!t enter into this type of calculation, in other words this ie sort of an isotope mass effect and that's our old picture of a single dose when the bone is already formed. Well, I could be wrong but I would certainly think the seme thing would apply in a growing animal. Hot when your mass of strontiun is so very emall compared to your calcium. MITCHELL These were tracer experiments. This is a single dose. You could do the seme thing with calolium 45. If you took calcium 45 instead of strontium &9 you would probably get the same results; that is an lectope mass effect. I think this 1s 9 second order correction. I think that we are on auch unfirm ground, I think this kind of a variation is less important than other things that we are considering. Thie is a theory related to what we discussed before and to the point om which we couldn't agree before, namaly if you fed strontium and ana DUE ARCHIVES 5 . of calcium intake starting with a low calcium intake and a standard af 4? PF