We have been asked about providing calcium to balance the raw meat portion of their diet. The considerations and calculations are provided here, the supporting tables are included under the vitamin mineral heading but linked below.
A 20kg animal requires 3000mg of calcium and 1500mg of phosphorus,
* 1kg of lean beef contains 100mg Ca and 1600mg P, so the remaining 2900mg of Ca has to come from a supplement
eg: 7.5g of calcium carbonate
or 20g calcium lactate
Because bone meal contains P as well, you cannot in practice balance the diet with it!
The calcium carbonate comes out ahead as a smaller (and cheaper) volume, but the calcium lactate can be given in water which the carbonate cannot.