With the purpose of having the reference values established for the biochemical parameters which evaluate the hepatic function through the determination of the enzymatic activities of the aspartate aminotransferase (AST) and gamma glutamyltransferase (GGT) of Jersey breed, raised in the São Paulo State, as well as, to evaluate the influence of age factors, sexual factors and of the infection by the bovine leukosis virus on the biochemical parameters mentioned, samples of blood sera from 170 animals were collected and examined, being 106 females and 17 males, clinically healthy and non-reagents to the glycoproteic antigen of the bovine leukosis virus capsule, and 47 sororeagent cows to the above mentioned virus. The reference patterns to the Jersey breed were established for aspatate aminotransferase enzymes (33.91±10.99U/l) and for gama-glutamiltransferase enzyme (13.21±12.72U/l). The seric activities of AST and GGT also had influence of age factors. The seric rates of AST raised with the age, the minimal value was observed in calves until three months age (26.39±22.17U/l) and maximal value was obseved in cows with age between 48 and 72 months (38.60±11.24U/l). GGT seric rates was higher for until three months age female calves (31.15±38.70U/l) than in older animals (between 8.70±2.40U/l and 14.24±10.37U/l). The evaluation of sexual factors influence and infection by Bovine Leukosis Virus on AST and GGT seric enzimatic activity had not showed the influence of these factors on the values found in this research.
Bovine; hepatic function; biochemical parameter; AST; GGT
