Why does Napoleon order that the hens' eggs be sold, and what happens when the hens rebel?

It is important to note why Napoleon
says the hens' eggs should be sold. He claims that the hens general make-up almost makes
it impossible for them to contribute to the labor and construction of the windmill. But,
they do have a commodity others value, and that could be their contribution: their
eggs.

The hens stage a rebellion of their own which
includes laying their eggs from the rafters so they break on the ground and are of no
use. Napoleon responds by withholding their food. After five days, a few die. The rest
decide its not worth it and give in to Napoleon's demands.