A case of diabetes mellitus in Japanese Black cattle.

A 3 year-old female Japanese Black cattle was diagnosed as diabetes mellitus (DM). Hyperglycemia (295 mg/dl), increase of serum fructosamine (487 micromol/l), elevated glycosylated hemoglobin A1 (GHbA1; 10.9%), low concentration of serum insulin (< 1.0 microU/ ml), increased serum glucagon (399 pg/ml), and glucose intolerance (glucose disappearance rate; k=0.53) were noted. On the histopathologic findings in pancreas, insulitis with infiltration of mononuclear cells was found. This case suggests that serum fructosamine and GHbA1 are available parameters for understanding of pathophysiological conditions of bovine DM.