title: Selenium, sulfur and nitrogen levels in ovine rumen microorganisms.
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D009584:Nitrogen / Q000032:analysis*; D012417:Rumen / Q000382:microbiology*; D012643:Selenium / Q000032:analysis*; D012756:Sheep / Q000382:microbiology*; D013455:Sulfur / Q000032:analysis*
chemical_list: D013455:Sulfur; D012643:Selenium; D009584:Nitrogen