I have learned one trick that might help. In order to get my hens to come to me instead of dashing about or shying away, I started hand feeding them the old fashioned way at least once a day. I toss them a handful or two of scratch grains. (Please don't jump me with squawks about nutrition, I give them plenty of the good layer pellets, this is a training treat) They adore this once in the evening treat so if I think they need a little extra calcium from their eggshells I mix in my oyster shells with the scratch grains. Since I started this my hens have started nibbling the oyster shells along with the grains and my eggs have much better shells. And the hens all gather 'round each evening for treat and pets.