SORD and cholestasis: Assessment of hepatic necro‐inflammatory activity and cholestasis in large animals requires the measurement of serum activity of liver‐derived enzyme including serum aspartate aminotransferase (AST), glutamic dehydrogenase activity (GLDH), sorbitol dehydrogenase (SDH), gamma‐glutamyltransferase (GGT), alkaline phosphatase (ALP).