Utah State University Extension
Beef cattle require a number of dietary mineral elements for regular bodily maintenance, growth and reproduction. Minerals that are essential in larger amounts are labeled as major or macro elements. Those needed in smaller amounts are called micro, minor or trace minerals. These terms, have no relationship to the metabolic significance of a mineral in the diet. A trace mineral can be as crucial to the health and performance of an animal as a major mineral.
Cooper, Troy D.; Rothlisberger, Darrell; and ZoBell, Dale, "Beef Cattle Nutrition, Minerals" (2014). All Current Publications. Paper 1297.