I have had three laying hens for the last six weeks or so and with the exception of maybe three days I get an egg everynday. The last couple days only got two. I am not real concerned about that unless I need to check for something? I noticed some thin shells recently, today I had a broken egg in the nest. I provide oyster shell all day as well as layer ration. I just started saving shells to dry out, grind and feed back. Should i do anything else?