and muscle function, as well as bone formation.
Most magnesium is found in the bone, but this is not a readily available source of the mineral as
bone turnover is controlled by calcium rather than magnesium homeostasis.
In the adult ruminant, magnesium is absorbed from the rumen and reticulum rather than the
small intestine, as is the case with monogastrics. Magnesium absorption is therefore dependent on
the concentration of soluble magnesium in the rumen fluid. Consequently, magnesium sources must
be soluble at physiological rumen pH if they are to be available to the adult animal.