ADA and mastitis: Mean values (± standard error of the mean, SEM) of salivary and serum TOS, TAC, OSI ratio values and ADA activities and aTOS: Total oxidant status; TAC: Total antioxidant capacity; OSi: Oxidative stress index; ADA: Enzyme adenosine deaminase type 1; bCTRL: Control group (healthy cows); NEB: Ketosis; LAM: Laminitis; MAS: Mastitis; MET: Metritis; cSL: Significant level for correlation between parameters.