The incidence of subclinical facial eczema in 10 Waikato dairy herds was investigated using the serum enzyme γ-glutamyltransferase (GGT) as an indicator of liver disease. Although only 127 (9.4%) of the 1357 milking cows and 4 (2.6%) of the 155 calves and yearlings bled were recognised to have had clinical facial eczema, 39% of the cows and 48% of the young stock had abnormal serum GGT concentrations, indicating recent liver damage.