I've been giving the Scratch & Peck brand (which is flaked), and have not seen any calcium deposits on the shells 👍
I did not know that about the sizing, but it makes total sense!
I have a Golden Comet that's been laying for about a month. She eats quite a bit of oyster shell... like a ½ cup every 1-2 weeks. I mostly feed starter/grower and all-flock, with about 10% layer feed mixed in. Her egg shells are solid, to the point where it can be hard to crack the egg!
Is...