A cow spontaneously affected with ketosis of digestive type before parturition was injected with a mixture of glucose and magnesium sulfate and cured in 4days. Another cow found on the 4th day after her 5th parturition to have been affected with the same type of ketosis was injected intravenously with a mixture of 200g of glucose and 10g of MgSO
4 daily for 2 consecutive days. She was cured eventu ally. Moreover, 13 cows with ketosis were injected with the same mixture. All of them, but one, were cured in 2-7days (4.3days on the average), without suffering from recurrence. The average serum magnesium level was 1.80mEq/
l at the time of clinical affection and 2.07mEq/
l after recovery.
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