I have also been frustrated with this recently, so I totally understand! I've had this problem since I bought 6 auction chickens last month. However, I've been feeding them a lot and it seems to have stopped. then it started again, but only eggs on the one ground nest, and now I think that may have been a skunk! I also am going to try some of the above suggestions.
You can look for yellow egg yolk on the beak of the egg-eating chicken. A friend said they do it while ON the nest, so look at their beaks while setting or just thereafter to catch them. Later, the yolk will wear off.
You can look for yellow egg yolk on the beak of the egg-eating chicken. A friend said they do it while ON the nest, so look at their beaks while setting or just thereafter to catch them. Later, the yolk will wear off.