pretty sure you mean roosting poles... most birds like flat perches, especially in a cold climate. i use 2x6's for my bantams and thats more than fine, i'm not sure if turkeys even roost but i know that peacocks need good roosts.
"Roasting poles"??? I usually use a metal spit over the fire.
For Roosting poles 2x4's with the large side laid flat for my standards and heavies. My OEG have a 1inch dowel rod. Thinking of doing the same for the bantams