The human rumen.
D000818:Animals; D002417:Cattle; D004063:Digestion; D005260:Female; D006801:Humans; D007223:Infant; D008892:Milk / Q000378:metabolism; D008895:Milk, Human / Q000378:metabolism; D012417:Rumen / Q000382:microbiology*; D013270:Stomach / Q000382:microbiology*