I have Bielefelders and noticed that my 8-9 months old rooster appears to be fully grown, while my 6-7 month old roosters are noticeably smaller. I will be growing them out more before processing.
I have not eaten any of my Bielefelders since I have other chickens to process before these come...
I agree, the roosters are generally quiet and very mild mannered. The hens are very quiet and always yielding to my more bossy hens....consistent layers and full bodied. We are breeding for dual-purpose, but have yet to eat any of them. ;)