Who is the bald guy wearing glasses on the Cheerios commercial?
No. The longtime host of Wheel of Fortune did get a lot of questions about his hair, and on April 1, 2008, did an on-air practical joke at the end of the show, in which he prodded Vanna White to "uncover his secret." She yanked on his hair and it was actually a toupee identical to his normal hairstyle, with Pat wearing a "bald cap" makeup underneath.
Most likely your hens are molting but if the bald spot is on the saddle...the area on the back just above the tail, what is happening is the rooster is wearing away the feathers from mating with the hen. This is normal and will last until the next molting period when the hen will not allow the rooster to mount her and her feathers will re-grow.