Onishiki was a bivoltine white Japanese used at some districts from the latter half of the Meiji era(Meiji era: 1868-1912), and afterwards, was used in small numbers to the middle of the Taisho era(Taisho era: 1912-1926). The origin is unknown.
The production of the parent eggs of F1 hybrid was as follows:
17,000 moths(in the 1st year of Taisho(1912))
15,000 moths(in the 5th year of Taisho(1916))
(It is presumed that one moth will hatch 400 eggs.)
1) Eikichi HIRATSUKA(1961) : History of Modern Silkworm Race Breeding, Dainippon Silk Foundation, Silk Science Research Institute, pp236
2) Eikichi HIRATSUKA(1969) : Genealogy of Japanese Silkworm Races for Practical Use, Dainippon Silk Foundation, Silk Science Research Institute, pp335