ok heres the scoop to the best of my knowledge. Gobblers head color changes depending on the mood, when they turn solid white (pretty boy) it is because they are a content gobbler, possibly about to breed. when they are blood red it means they are fired up, and ready for a fight or some action, this being due to the big caruncles(spelling?) filling up with blood.

could be WAAYYYYYY off track here but this is how it was explained to me.