An abnormality of the proventriculus of the chick.
D000818:Animals; D001717:Birds; D002645:Chickens; D000013:Congenital Abnormalities; D004194:Disease; D041981:Gastrointestinal Tract / Q000002:abnormalities*; D008460:Meat; D011200:Poultry; D011531:Proventriculus
ABNORMALITIES; FOWLS, DOMESTIC/diseases; GASTROINTESTINAL SYSTEM/abnormalities