Ladycatpurrs, that's pretty funny. But it works. I sat outside by the coop all day once to catch my egg eater, and I did. I heard that moving their nests helps too.
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Good logic and explanation of the what to do and why, mtnlaurl!That's what I do, too, and that works providing you've got a decent shell to begin with. That's not likely the case here. If the hen is eating her own eggs because she needs calcium, it's likely her own shell is calcium deficient and it isn't going to be much help feeding it back to her. She needs another source of calcium and the easiest would be oyster shells.
Putting mustard in the egg shell not only sounds like a lot of messy work, it doesn't get to the root of the problem as to why the hen is eating her own eggs. It's quite likely that she's in need of protein and an egg is some of the best protein there is. It's certainly the easiest protein for a chicken to find. I'd suggest they increase her protein via the addition of meat to her diet or by fermenting her feed and also give her a 24/7 source of oyster shell. It's likely that the egg eating will resolve itself once the underlying cause is defined and resolved.
Is it possible that the chickens are not eating the eggs, but you have a rat sucking them. The fact that there's a small hole does not match with what I remember of egg eating chickens.I've had this problem for at least 6 months. I used to get 6 eggs a day and now I'm lucky if I get two or three. They always have an endless supply of pellets/crumbles and water. We give them leftovers from the kitchen and garden almost daily. I've been giving them oyster shell for two months and nothing has changed. I'm trying to collect the eggs twice before noon and that seems to help.
We're thinking of building nest boxes where the eggs roll into a separate area so they won't be able to eat them, but some won't even lay in the box, they lay on the floor in a corner.
The thing that I've noticed is that they like the inside of the egg and not the shell so much. I see the egg that's left behind and it has a small hole. I've even seen them eating the inside of the eggs and not really paying attention to the shell.
I put golf balls around where they lay, so we'll see if that helps.
Eating eggs is a sign of an imbalance in diet.
usually they are craving the calcium in the shells.
Make shure you have a good supply of 16% or better protein layer feed, and provide free access oyster shell. (grit also)