I thought a lot about your Phoenix question last night, as to why people say not to cross in these German fowl ( in the same vein, you hear not to cross in Ohiki, which is Japanese). Both CAN carry mt ( the non molting gene).So, back there in the genetics, someone may have crossed in a Dunn ( blue) bird and now it is showing up as a throwback; or one of the other two scenarios.
But, after all, a much greater variety of chicken breeds have been in the background of the Genetic Hackle Fowl— this is evident in the huge variety of combs, the discrepancy in a constant size, and in the writings of the breeders. Without doing a genetic test, we really don’t know what breeds were used, other than the oft-stated Barred Rock, Araucana, and Rhode Island Red.
We have clues— from Darbee’s writings; from throwbacks that appear in the linebred birds when you bottleneck the population; and from modern breeders as well.
Dr. Tom Whiting has a plethora of videos on YouTube that are definitely worth watching to learn( though it’s hard to hear him at times over all the crowing in the background, ).
I mentioned before he said he crossed in Silkies. He also stated when working for the Dept. of Ag. he was able going to import Coch de Leon birds from France ( I know I am not spelling that correctly, sorry).
In an aside, Dr. Whiting remarks that he has crossed in MANY other types to his lines, but (quote) “I would not even divulge what these breeds are to my own mother.”
You see the (understood) secrecy involved when your livelihood is dependent on having some very unique traits in your birds. It has taken Whiting, Metz and others many years to get to where they are now.
It’s a far cry from the early days of Darbee—-who never sold birds, but gave eggs/birds to other fly fisherman with the same goal —to further the feather quality —without thought of dry fly feathers being a profitable enterprise.
It furthermore demonstrates how times change.
There may very well be Phoenix (like the Schubert line); Yokohama’s,MiniOhiki, Ohiki, Sumatra, Aseel, Sumatra, Shokuku or Onadagoris( that last breed is almost a given for value of the mt gene) in Genetic Hackle Fowl. Mr. Reeder has reasonable suspicion from his work that it is highly possible Green Jungle Fowl may be back there is these lines, because of the molting pattern that matches the Green Jungle Fowl. That is an interesting thought.
We do not know without a DNA test.
I dont know if there is a DNA test for chickens that has the sequences of every single common —and rare— breed out there. Especially with néw threatened or nearly extinct European breeds being introduced yearly.
Sorry this was so long. I never have anyone to discuss the possibilities with locally. Hope your eyes did not glaze over.