Plasma Glutamic-Oxaloacetic and Glutamic-Pyruvic Transaminase Activities in Holstein Cattle. I. Effects of Stage of Lactation, Gestation, and Level of Milk Production

Abstract A total of 748 jugular vein plasma samples was taken from 69 Holstein cows sampled monthly throughout one lactation and the corresponding gestation period. Glutamic-oxaloacetic transaminase activity varied significantly (P