Increased incidence of avian leukosis in response to excess vitamin A.
D000818:Animals; D001354:Avian Leukosis Virus; D004032:Diet; D005260:Female; D007938:Leukemia / Q000453:epidemiology*; D008297:Male; D011200:Poultry; D014801:Vitamin A / Q000008:administration & dosage / Q000494:pharmacology*
D014801:Vitamin A