Champion's Choice Selenium 90 Salt 50lb is formulated to provide essential salt plus the correct balance of trace minerals. Perfect for use with healthy beef and dairy cattle, swine and horses. Includes zinc .35%, iron .20%, manganese .20%, copper .03%, iodine .007%, cobalt .005%, as well as selenium with is a preventative measure against paralysis, heart failure, nutritional muscular dystrophy (white muscle disease) and reduced reproductive performance in older beef animals.