I wouldn't scramble the shells in yet, those I give to my laying hens. But since the chicks in shell absorb the egg yolk as their food source while growing stands to reason it contains a lot of stuff they need and it's good for them. It's high protein and palatable for sick chicks or weak chicks who need a boost.
I put eggs thru a food processor and feed to all my birds, caged and chickens. The caged birds get the entire egg scrambled shell and all (that's why I use a food processor). I also put the cooked eggs back thru the processor just to make them tiny sized.