The production of milk on protein-free feed.
D000821:Animal Feed; D000818:Animals; D002364:Caseins / Q000032:analysis*; D002417:Cattle; D004044:Dietary Proteins; D004586:Electrophoresis; D005260:Female; D005502:Food; D008892:Milk / Q000032:analysis*; D000644:Quaternary Ammonium Compounds; D014508:Urea
D002364:Caseins; D004044:Dietary Proteins; D000644:Quaternary Ammonium Compounds; D014508:Urea