There are several essential nutrients that livestock require to be healthy. Without these nutrients, farmers will notice major differences in animal behavior and growth. Some essential minerals for ruminants (cattle, sheep, goats) include calcium, sodium, magnesium, selenium, and phosphorus. Grazing provides most of the nutrients that livestock need, apart from minerals, so grazing animals will need to be fed a mineral additive. Grazing fresh forage offers livestock excellent sources of vitamins A, D, and E.