Dear Rami
Unfortunately still many of the nutrients in feed specification for poultry is crude, like CP , CF , EE and of course Ca.
Ca is usually over supplied to the poultry diet from many sources like:
Drinking water (as a rule of thumb poultry take water twice the feed intake) , Carrier in premix , concentrate , pro-prebiotics also as anti-caking agent in SBM.
For example when you add 1 kg ...