I’m pretty new to this so hopefully you’ll get other replies. Egg shell is not a good source of calcium since it is not balanced with Phosphorus. You can add a human grade bone meal, I’ve ordered Kal from Amazon but haven’t used it since Katie likes chicken wings, backs, thighs and feet. You can also get a grinder, probably for around $100 and grind necks. If you want to grind anything bigger like drumsticks, I’d get a stronger grinder. It is my personal opinion that natural bone either whole and chomped or ground is better than any supplements since it is perfectly balanced. Heart is counted as muscle meat not organs. So 5% Kidney and 5% Liver is correct, heart is great but just don’t count it as organs.
