Welcome to BYC. I just saw your other post about the broken egg inside of your hen. Did you try to get it all out? Was it soft or a hard broken shell? Most people use layer feed that has 4% calcium, and add crushed oyster shell on the side or crushed egg shells fed back to the chicken for calcium. In an emergency, you can give calcium gluconate liquid from the feed store, or a Tums or calcium tablet crushed and fed in some yogurt or other food. The calcium gluconate can be given orally--the dosage I am finding is 50 mg for every pound of weight.
