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Medical Definition of Lambing sickness
1. A highly fatal metabolic disease of well-nourished ewes in the late stages of pregnancy, especially in ewes carrying twin lambs; it is caused by carbohydrate depletion of the blood and tissues, and is characterised by hypoglycaemia, ketonuria, fatty infiltration of the liver, rapid emaciation, coma, and a high death rate. Synonym: lambing paralysis, lambing sickness. (05 Mar 2000)