Abstract: Fatty liver syndrome (Hepatic lipidosis) or fat cow syndrome is a major metabolic disorder in many dairy cattle’s in early period of lactation. The aim of this study was to evaluating fatty liver syndrome in dairy cattle in Tabriz by measurement of TG, APO-A and APO-B serum values. The results showed that TG has a negative correlation with APO-A and APO-B. Thus with elevating of TG serum values, APO-A and APO-B contrary diminished.