Egg shells too. I'm not sure how they'd be processed, but I'm guessing bake them in the oven and disintegrate it all in a food processor.
I had a discussion with other members about using eggshells as fertilizer in the garden. Turns out that the calcium in eggshells is bound up and the only way to break the bond is using something like a vinegar solution and letting everything soak for a week or more. Crushing up the eggshells will not break the chemical bond and release the calcium to be taken up by the plants. It has to be cooked, crushed, and soaked in a vinegar type solution.
I ended up crushing my eggshells and tossing them out in the chicken run. The chickens can eat what they want and maybe get some calcium from their digestive system. I don't have time for all the cooking, crushing, and soaking eggshells in vinegar for weeks.I have a separate calcium feeder for at will feeding for my chickens, but my bag of calcium I bought 4 years ago is still mostly full. My chickens don't eat much supplemental calcium. I suppose you could puree the eggshells in a food processor down to very fine bits and put it into a separate feeder. But that takes time and I'm too busy right now for things I don't really need to do.



Little emotional this evening. Last Friday I purchased a used Murray riding mower that looked like a really good deal. The original owner had the shop put in a brand new engine, but then he never came back to pay for the mower. I got the mower for half the price of the new engine and repair bill, so I was pretty happy about that. It rained all weekend, so this evening was the first chance I got to take it out for a test drive. Found out really fast that the shop had not checked the brakes on the riding mower and almost got myself into an accident going down a gentle slope with no way to slow down the mower. Immediately called the shop and left a message for the small engines manager. Will be talking to her tomorrow.
Yep, it was you that posted that .pdf link!