Changes in the calcium and magnesium of the serum and in the inorganic phosphorus of the blood of cows at calving and of the calf during early life

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Abstract
Earlier data on the decrease in serum Ca and biood inorganic P of cows just before and at calving are confirmed and data presented to show that, while the serum Mg fluctuates rather widely about this period, it tends to rise to a higher level just before, at, or within 24 hrs. of calving. In general, scrum Mg varies inversely with serum Ca. Calves at birth and for the first 8 wks. of life show rather higher levels of serum Ca and blood inorganic P than the normals for the dam, while the serum Mg level at birth is lower than the dam''s normal, which it attains after 3 wks.