This is attributed to the lowered blood Ca. Good management practice can prevent this problem. Its metabolism is tightly coupled with Ca. Only microbial phytase is capable of liberating P. Deficiency of P includes rickets and osteomalacia. Animal deficient in P often develops abnormal chewing and eating behavior, which is termed pica.
High fluoride interferes with P digestion and absorption.
Half of Mg can be found in bone and teeth, and the other half is used as cofactor for various phosphatases. Vitamin D does not affect Mg absorption. PTH increases the release of Mg from bone. Grass tetany is the most common Mg deficiency in grazing animals. It has been linked to the increased trans-aconitate in the green pasture in the spring.