Origin(Datenishiki)

"Kaiko No Shuruigo"(in the article about Ikeda Chojiro) notes that the original strain of Datenishiki has been passaged from the era of Enpo(1673-1681). And the original strain was descended from Matamukashi. And it was peanut shaped. Namely, Ikeda Chojiro established "Datenishiki" in the 17 the year of Meiji(1884) after the breeding for 3 years by cross combination between the Matamukashi and Koishimaru. The healthiness of the Datenishiki was large. As the quality of the cocoon filament was excellent, the raw silk made of Datenishiki was optimum material used for weaving light weighted Kawamata Habutae. Matamukashi of the original strain had difficulty in rearing. The reason was that Matamukashi was descended from Akajuku hard to rear. Nevertheless, the rearing of Datenishiki had come easily to rear by cross combination between Matamukashi and Koishimaru descended from Aojuku of large healthiness.
According to another version, Takahashi Zenjiro, an inhabitant of Ohira-village, Adachi-gun, Fukushima Prefecture, started the cross breeding between Matamukashi for spring rearing and Aojuku in the 13th year of Meiji(1880). And he established the race and called it "Datenishiki" after repeating the selection in the 22nd year of Meiji(1889). It was said that the Dataenishiki had excellent quality of cocoon filament and 1,000 turns of cocoon filament length.
(The counter reel: 1 turn=1.125m, 1,000 turns mean 1,125m)
Datenishiki was held to be important in the era of Meiji after 17th year of Meiji(1884), and followed in mid-Taisho.
(Meiji era: 1868-1912, Taisho era: 1912-1926)

Production of Datenishiki in Japan
In the 1st year of Taisho(1912): 110,000 moths
In the 5th year of Taisho(1916): 524,000 moths
(It is presumed that one moth will hatch 400 eggs.)

References
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