Theoretical view is a little bit complicated. First - what kind of light is used? (you can see: http://www.ut.ee/katsekoda/IR_Spectra/pdf/calcium%20phosphate.pdf) What amount CCP will influence the milk? (what detection limit has apparatus?)
The practical (empirical) view is better. You can simulate similar case and get answer.
More details related to CCP decomposition would be helpful. I think that changes in CCP could be simulated using scattering calculations. We can discuss further details by messages.
The "simulate" means NO ONLY computer simulation. An another simulate is - exact way : you add calcium phosphate into milk and do!!! backscatter measure. And the question is answered.