How much calcium should your hens get?
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If you are referring to things like crushed oyster shell to keep their eggs shells hard, I think most people just let them have that free choice. That won't eat too much but seem to eat the amount they need. I have mine in a vertical 6" PVC pipe 4 feet long, screwed to a square base. At the base a hole is cut and they peck at the shell at their leisure. I only have to refill it every six months. Hope that helps.