The hens began a rebellion:
Led by three young Black Minorca pullets, the hens made a determined effort to thwart Napoleon's wishes. Their method was to fly up to the rafters and there lay their
eggs, which smashed to pieces on the floor.
Obviously this effort was one of sabatoge. The hens cared nothing of the eggs for motherly purposes. They only intended to demonstrate to Napoleon that they were indeed in control of something... when and where the eggs would be laid, and therefore what the eggs would be used for. In this destroyed state, Napoleon would not be able to sell the eggs to humans.
After this incident occured, Napoleon responded swiftly. He ordered that the hens have their rations cut, and if animals helped give them any food, those animals would be put to death. This suppressed all the animals into obedience.