Urea concentration in bulk milk as an indicator of the protein supply at the herd level.
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002417:Cattle / Q000378:metabolism*; D004044:Dietary Proteins / Q000032:analysis; D008892:Milk / Q000032:analysis*; D014508:Urea / Q000032:analysis*
D004044:Dietary Proteins; D014508:Urea