answer:Hopefully, Coloma will appear with advice from experience, but in the meantime, from a website for people with backyard chickens: “Egg eating often starts when an egg is accidentally broken in the nest box, and the hen pecks at it. Finding that this weird yellow substance is tasty, they will quickly devour it, and when they lay their next egg- look for more. Other hens that catch the original one doing this habit may even join in- and you’ll end up with a whole flock of egg eaters. ” They offer tips of breaking roosters of the habit – maybe you can pass them on.