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If they have the origanal lines they have to be terribly inbred after 30-50 years and if they are not inbred ( introduced new blood ) then they do not have the " origanal " line LOL
Unless they introduced a new blood line with another of the same line.
Of someone elses bloodline, breeders selected by someone else, etc. Both lines originating from the same bloodlines.
Just like chickens, the blood line can be crossed with its own but owned and selected by another. Because everyone makes different choices in the breeders. That is why trading birds or eggs can work to continue a blood line. Buckeye, RIR, NHR, etc. etc.
That is why they put markers in the meat birds. So people could tell one from another. (Ha, I thought I had thought of something new, they were decades ahead of me).
I imagine that is why the A&M Whites really have the dot on the heads. The Browns had the Beige or another mutation added depending on which country you were in. Problem is the birds started mutating and changing. So, now we can't be sure, I don't think they thought this would happen.
Yes, I have a study to back these statements up.