I went out today to check under my broody (someone is going in and laying an egg and I have to pull it every day) and besides the new egg there were only three cochin eggs where before there were four. Three of the eggs were viable when I put them under her, the fourth one was from my cochin and evidently not viable! There was busted egg and shell in the nest, so most likely she was cleaning up. I guess mommy knows best!