1997 年 46 巻 1 号 p. 93-94
"Dilute down lethal (DDL)" is a new mutation of Japanese quail (Coturnix japonica). Neonatal plumage of the DDL mutant is the same as the wild type in pattern, but its coloration is slightly lighter than that of the wild type. In addition to the down color abnormality, some DDL chicks have bent digits. All DDL chicks die within three days of age. Genetic analysis revealed that the DDL mutation is controlled by an autosomal recessive gene. The proposed gene symbol is ddl.