Hi. I'm currently trying to work out the best way to feed my 5 cats a balanced raw diet. (They are currently eating 50% wet/50% Porta 21 Grain free dry, supplemented by the occasional raw treat, but I'd like to change to 100% raw, if possible.) My main concern is ensuring they get their 10% calcium, as they refuse to eat the bones on the chicken wings I give them. I know chicken necks are better, but they are unobtainable where I live.) I've heard that you can substitute ground eggshell instead of bone, and that this is a lot safer (no danger of splinters...) Is this true? If so, would I just add 10g of eggshells to 80g muscle meat & 10g offal to achieve a balanced diet? Or would 10g eggshell be too much, as it's a more concentrated source of calcium? Would appreciate any advice from experienced raw feeders, as I'm terrified of doing the wrong thing for my cats.