title: FDA reaffirms position on extra-label use of ionophore drugs.
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D005260:Female; D007476:Ionophores / Q000627:therapeutic use*; D007774:Lactation; D007880:Legislation, Drug; D007886:Legislation, Veterinary; D014481:United States; D014486:United States Food and Drug Administration
chemical_list: D007476:Ionophores