What i can tell you is the first flock was brought to Iowa state or Ohio i can remember off the top of my head, but that was in the 1930s.
Im very involved with a small charity and the elderly night watchman whom just passed away,told me they Egyptians call them by other names,same chicken different name depending on what part of Egypt.he stated that they have been around since his grandfathers,grandfathers grandfather x 7 or more,whatever that means, he lost me on that math.. i was doing a video link with him as he raised chickens and superb horsemsn
There is significant research dating back 100 years into these chickens in egypt,europe and the u.s. due to their resistance to mareks,some strains of avian influenza and two others but cant remember..also known as bigawi and some of older research papers name other names cant find name by googling have to look up the research papers