The reason that I don't feed developed eggs to my Pigs is because my Pigs might get the idea that eating Chicks is good. I free range my Chickens, Ducks and Geese and they spend a lot of time in the Pig compound.... ....here Chick, Chick, Chick
The eggs that don't hatch under our hens are almost always ROTTEN anyway. Those go into the woodstove, explode like stink bombs in there and then end up in the garden with our ash.