In "Animal Farm", why does Napoleon order that the hens eggs be sold and how does he react when the hens rebel against his orders?

Conditions on the Animal Farm are growing worse. It is winter and food is scarce. In order to make some money to buy food and keep the farm going, Squealer announces that the hens must give up 400 eggs a week. The hens consider this murder so they begin the lay their eggs in the rafters of the barn and smash them on the floor. Napoleon retaliates by refusing the hens food. He tells the other animals that any one caught giving the hens even one pellet of corn will be executed. The hens hold out for five days and are then forced to surrender. Napoleon is able to supply 400 eggs a week to Whymper.