Busted 3 out of 5 of my flock in corner this morning, egg on faces. As the girls have litterally just started laying this week I know the shells are slightly weak. Boosting the protein and trying the egg bombs!
*edited to add*
I have just tried the egg filled with dish soap on my Mother in Laws old maltese cross shitzu. Hes been an egg eater as long as he lived with her (but she never told us that when she sent him to live with us) and the absolute disgusted look on his face! he doesn't look like he'll be going near the coop for awhile
It is very difficult to stop egg eating. It can be done however with a ton of intervention. This article gives you some valuable tips to curb the eating.
Egg eating can be very difficult to stop. Another way to increase protein is to give them growers pellets but be sure to have plenty of oyster shell available.