Abstract
THE most characteristic biochemical change associated with the disorder of cattle known variously as grass staggers, lactation or nutrition tetany and Hereford disease is a fall in the blood-serum magnesium concentration from a normal value within the range 2.0–3.5 mgm./100 ml. to one of 0.7 mgm. or less. The disorder has its highest incidence in milking cows in spring, shortly after a change from winter rations to the grazing of pasture, and under such conditions frequently the fall in serum magnesium concentration is rapid; in extreme cases serum magnesium values of less than 0.7 mgm./100 ml. are observed within two days of the change of diet.
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