Southern States Traditions Hi-Mag Beef Mineral is a free-choice mineral for beef cattle on pasture. Formulated with supplemental levels of Vitamins A, D, E, selenium as well as 14% magnesium. This supplement is designed to meet the daily nutrition requirements for health and reproduction. It is best to provide Southern States Traditions Hi-Mag Beef Mineral to your cattle 2 to 4 weeks before grazing tetany prone pastures.