The ceruloplasmin oxidase activity as an indicator of serum and liver copper levels was evaluated and two different methods of ceruloplasmin determination (paraphenylen and ortodianisidine) were compared. Fifty six serum and liver samples from Nelore heifers were used to evaluate copper concentration and ceruloplasmin serum activity. The correlation coefficients between cooper serum values and ceruloplasmin serum activity using paraphenylen and ortodianisidine were 0.75 and 0.62, respectively. The correlation between ceruloplasmin serum activity and copper liver concentrations were 0.15 and 0.12, respectively, for paraphenylen and ortodianisidine. No relationship between serum and liver copper levels was observed. Cooper serum determination by paraphenylen method showed higher correlation with liver copper level in comparison to copper serum determination by ortodianisidine method.
bovine; copper ceruloplasmin; liver biopsy
