I have read about using various parts of the internal organs for soups/stocks or just plain eating, (gizzards, livers, hearts, etc.), but what do you do with the other stuff like the intestines, lungs, and other parts? Can I feed them back to my layers? Should I cook them first? Are there any parts I should not use for anything? I'm processing my first bird this weekend and would like to not have anything wasted that I could have used.