they'll eat poo too if they have nothing elseIt's the corn. They will eat them if they have nothing else.
Do laying hens eat and forage in excreta from other hens?
https://doi.org/10.1017/S1751731118001143
from 2018, with one experimental bin consisting of 100% excreta

A now near 50-yr old paper reviewed the inclusion of poultry manure in poultry rations at that time
https://doi.org/10.1016/0304-1131(76)90008-4
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