In the early 20th century, Japanese breeders began to selectively breed for increased egg production. By 1940, the quail egg industry was flourishing, but the events of World War II led to the complete loss of quail lines bred for their song type, as well as almost all of those bred for egg production.
Why did the Japanses begin to breed quails in teh 20th century?
Japanese breeders began to selectively breed for increased egg production.