I live on the Chesapeake bay and have discovered chicken crack! I grind up the left over shells, guts, legs and such of blue crabs and let my girls have at it (not the lungs though). My problem is that I cannot find any nutritional info on ground crab shell and guts. I have found plenty on kiln dried crab shells and commercial crab meal, but I don't think that it is the same, since my leftovers are not dehydrated. I am worried about giving my girls (2, 18mo red rocks) too much selenium. I mix their grain myself. The recipe changes with the season, based on what is readily available. I feed my girls organic and local, so adjusting the recipe helps keep the costs down. Tthat being said, I honestly don't know how much selenium they get in their normal diet. Does anyone else feed their girls blue crab or have any advice on how much I should allow them daily?