Thank you for your reply. I see an obvious decrease in the bowls and whenever I refill they are eager to get them - they like the egg shells best so there is alway competition who get them first. I’d say my whole flock has thin shells with 3 of them being slighter thinner than the other 3.
I have 6 chicken, 4 are in their third year laying and for 2 it's their first year. This year I noticed that their shells are really thin. I have not changed their food since I got them 4 years ago. They are getting a high quality layer pellet (Bar ALE's 16% Non-GMO Layer feed is made...