Yes, but I think that “exhibition” Rhode Island Reds had a broader genetic pool at the time
If you look at this vintage post card, these RIR are lighter and shorter bodied than our current exhibition birds.
I think it must have been a divergence NHR breeders decided to focus on meat and kept...
I disagree:
“Hybrids Fueled the Modern Poultry Industry
During the Twentieth Century scientific breeding revolutionized poultry. College educated geneticists created modern hybrids with the intent to create strains of birds especially efficient in converting feed into eggs or meat. Probably the...
No. Some are mixes, some are too new to be a breed. Some are too inconsistent to be a standardized breed, which is a landrace breed. Some landraces are heritage and some aren't (like Easter Eggers.)
A hybrid could never be a breed. Its offspring could be standardized into a breed but the hybrid...
Not every crossbreed is a hybrid.
Hybrids are created by crossing two intentionally inbred lines. If you cross two breeds and then breed their offspring you weren’t crossing them just for the end result of more productive first generation birds.
Leghorn Red Malay crosses are not hybrids because...
https://livestockconservancy.org/heritage-breeds/
Hybrids are crosses between two breeds for increased production and often sexlinked offspring as well (the males and females can be told apart at hatch.) Hybrids do not breed true.