A lethal defect in the domestic fowl.
D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D005260:Female; D005804:Genes, Lethal; D005808:Genes, Recessive; D008297:Male; D011201:Poultry Diseases / Q000151:congenital* / Q000473:pathology; D013249:Sternum / Q000002:abnormalities*