Relationship between postnatal days serum Cu concentration and plasmadiamine oxidase activity in Japanese Black calves

摘要

The aim of study was to investigate the relationships among serum diamine oxidase (DAO)activity, postnatal days and the plasma copper (Cu) concentration, using calves with orwithout diarrhea. In healthy calves, the serum DAO activity was significantly higher at 2postnatal days than at ≥7 postnatal days, and no significant changes were observed after 7postnatal days. In addition, no significant correlation was found between serum DAOactivity and plasma Cu concentration at all postnatal days in healthy calves. Although,the serum DAO activity in 14 diarrheic calves (66.78 ± 14.37 IU/ml) waslower than that in 19 healthy calves (170.33 ± 97.83IU/m, P<0.01), plasma Cu concentrations in all calvesremained within the normal range.