Hi Nick,
I tried to find the info on eggshells as we had this discussion on another forum. I can’t find it, but yes, they are essentially all calcium plus essential minerals and if you use the entire eggshell, it throws off the calcium/phosphorus ratio. That’s why you dry the egg and grind it up. I’m including a couple of other links regarding eggshell as they really need to be cooked to kill the possible bacteria, particularly if you store them.
http://www.livestrong.com/article/490605-eggshell-calcium-as-a-source-of-calcium/
http://nutritiondata.self.com/facts/custom/1145333/2
This is a good site for recipes as well. This is the calcium discussion:
http://dogaware.com/articles/dwcalcium.html
This is a cat site but it discusses the calcium/eggshell quantity:
http://www.holisticat.com/en/raw-feeding/2-esp.html
Good Luck with it! 🙂
