Have you tried a combination of vinegar and mustard?
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Naaahh, Not True.if you do the egg shells for supplimental calcium, be sure to wash them good and not leave any egg on them and make sure they are dry before you crush em up...
they will all get a taste for the egg left behind and you will have coop full of egg eaters... in my opinion, shells for calcium is a really bad idea... to a point... sadistic...
Remember when "mad cow disease" broke out a while back? and the pinpointed the root cause to feeding the cattle protien from other cattle... "maybe the good Lord was tryin to tell us somethin"oyster shell is best for supplimental calcium... if they dont get calcium the eggs they lay in the future robs it from their bones.... it's kinda like chicken ostioperosis.
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besides... they are not eating eggs for calcium, anyway.. it is for the protien and it just plain tastes good to em... else you wouldnt find the whole shell left behind...
I would try meal worms as a treat for the ole gals... protien and they love the taste of em apparently... ya kill two birds with one stone (no offense to the coop there!).
rollout nests are always a good alternative for the die hard egg eater. i had one that just would not give up. had to take her out of the rotation, because egg eating is contageous...
one sees the other doing it and it immediately becomes a good idea...