My response to that information would be that its incorrect. Been raising Wyandottes for many, many years now and its just not true. At least with my birds and those of other breeders I have known. If you start talking about a Wyandotte with a single comb, the first wrong thing you are saying is that it is a Wyandotte. If its not a rose comb, its not a Wyandotte. Period.
I love scientific research, love to read about stuff like that but sometimes it just doesnt hit the nail on the head or does not refute what common knowledge or experiences may have taught.
I am a coach, have been so for 15 years. I will talk to new coaches who will start spouting the scientifics of this exercise or that exercise....my question to them always is? Does it work? They usually dont have an answer. I will train a certain way because I know it works, from experience and my own common knowledge. There is no science that replaces wisdom of experience.
My apologies. Not trying to flame and I will get off of my soap box now.
Have a great day!