What foundational fowl stock originated the Yokohama chicken line?

Onagadori

The foundational stock for the Yokohama chicken breed traces directly back to the *Onagadori* fowl, which were historically highly valued in Japan specifically for their ability to grow extremely long tail feathers, sometimes extending several feet. When these birds were first introduced to European and North American breeders in the late 19th century, primarily exported through the port of Yokohama, attempts to replicate the ultra-long tail proved challenging in different environmental conditions and under varied breeding objectives. Consequently, the resulting Yokohama bird became a descendant breed, diverging from the singular focus on maintaining maximum tail length found in the original specialized Japanese stock, instead favoring hardiness and specific color patterns.