We used to butcher chickens and feed the entrails back to the remaining birds. Seems gross on some kind of gut level (no pun intended), but rationally I can't see any reason it's any worse than just throwing them away. Protein's protein, and resources are resources. We finally quit because somebody told us that feeding raw chicken to other chicken can spread disease. I have my doubts about that, if the original chicken was healthy. So, a bit weird, and possibly a vector of disease if the meat isn't cooked, but morally wrong? Nah.