Milk secretion and re-absorption from the udder.
D000818:Animals; D001940:Breast; D001942:Breast Feeding; D005260:Female; D006801:Humans; D007774:Lactation / Q000502:physiology*; D008321:Mammary Glands, Animal / Q000502:physiology*; D008892:Milk
LACTATION/physiology; UDDER/physiology