RE: breeding or roosting?
Shallow lol,
I would have to wonder how many turkey hunters notice this, or see it and don't even think about it.
This is a light colour skinny long flaking area located on the lower breast close to the middle of the rib cage. Yes this is an area where a bird that is in the roost settles down and balances him or her self by gripping of the feet and resting the heavy body weight on the limb.
I seen this action all the time and got some up close viewing of penned birds while they roost.
This is the reason some Gobblers become beardless, because wet beards now can lay on the branch in an area where body heat can not keep it from freezing to it.
Threads like this are great to learn from.