Is there a hump in his back? Have you let him try to cover a hen?
That hump is his hips. His breast is so heavy his front end is weighted down and his butt is in the air causing a humped appearance. Watch out for green muscle in a breast that large. Deep pectoral myopathy (DPM) is a degenerative muscle disease of heavy chickens and turkeys commonly referred to as 'Green Muscle Disease'.
Cockerels have to be able to pull up their chest to jump up. I believe he will be an AI candidate as long as the excitement does not cause aortic dissection.
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