Figure 1: Glucose tolerance test curve. Seven healthy cows (C) and nine cows with ketosis (T) that were divided into the high glucose (Glc) level (T1, 5 cows) and low Glc level (T2, four cows) according to plasma Glc concentration at 120 min. Plasma Glc concentration were measured at 15 minutes before administration of glucose, and at 0, 15, 30, 45, 60, 90, 120 minutes after administration of 1000 ml of 50% glucose by jugular intravenous infusion.