Those eggs actually haven't been fertilized by a male chicken yet. There's no life in them. They would be akin to the unfertilized eggs that human women release every month. 

A separate life begins at fertilization, or "conception," and any purposeful action taken to stop the life after conception is abortion.

And there is a huge difference between humans, who have been given life through the very breath of God, and animals. Animals don't have spirits or souls.