title: Effect of dietary nitrogen on the rumen microbial population in lactating dairy cattle.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000254:growth & development*; D002417:Cattle / Q000382:microbiology* / Q000502:physiology; D004044:Dietary Proteins / Q000008:administration & dosage*; D005260:Female; D007774:Lactation; D011247:Pregnancy; D012417:Rumen / Q000382:microbiology*; D014508:Urea / Q000008:administration & dosage*
chemical_list: D004044:Dietary Proteins; D014508:Urea