It is a very hard habit to break once your chickens have got a taste for their own eggs. They will devour them like a child does candy given the chance. So a very simple tip is to actually feed them some rotten eggs. It makes them think twice before turning on their own clutch.
However it is also an idea to prevent the problem before it becomes a problem. A dietary supplement of ground oyster shells will correct any mineral deficiency that may motivate the hens to turn on their offerings. You can obtain ground oyster shells at any agricultural feed suppliers.
If you cannot get hold of ground oyster shells or would like to use an alternative then save the egg shells that you use. Wash them clean and bake them in a hot oven for 20 minutes. When they have cooled grind them up and add to the chickens food. This will achieve the same effect as the oyster shells.
