It is stored in low levels in the cows body and requires regular daily intakes. Magnesium can play a key role in enzymes, muscle and nerve function. In ruminants the main problem we see is tetany (deficiency) and death. This is one of the most serious deficiencies because of the speed of onset to collapse and death.
When animals begin lactating the demand for magnesium can rise quickly. Sodium also helps in the digestion transport of magnesium from the gut into blood.