Chronology of aspartate transaminase (AST) activities of study animal (SA) 4, SA 6, SA 8, SA 20, and SA 22. The empty symbols depict the days on which creatine kinase activities were above the respective reference range. Blue continuous vertical line: Beginning of acute stage of SA 4. Red hashed vertical line: Beginning of acute stage of SA 6. Black continuous vertical line: Day of seroconversion. Hashed horizontal lines delimit Simmental reference range. Continuous horizontal lines delimit Limousin reference range.