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Magnesium and Vitamin D Relationships in Calves Fed Mineralized Milk

Department of Dairy Industry, Ohio Agricultural Experiment Station, Wooster, Ohio

ABSTRACT

Three calves fed a basal ration containing a limited amount of winter milk plus iron and copper salts were compared with three calves fed a like ration supplemented with magnesium carbonate and with three calves fed the basal ration supplemented with magnesium carbonate and vitamin D (ultraviolet light). When magnesium was not added, blood serum-magnesium and bone-magnesium were lowered. When magnesium was added, the blood serum-magnesium and bone-magnesium were normal. Ultra-violet radiation produced somewhat heavier bones (green weight, in those calves fed the milk-iron-copper-magnesium ration.