Physiological causes of paired oviducts in ducks.
D000818:Animals; D004372:Ducks; D005260:Female; D006801:Humans; D008460:Meat; D010057:Oviducts / Q000502:physiology*; D011200:Poultry / Q000502:physiology*
OVIDUCTS/physiology; POULTRY/physiology