H. Liu, X.P. Tang, R.J. Fang, F. Yi, C. Zhang, R.Q. Yang, F. Sun and S.Y. Zhou, 2020. Effects of Copper Amino Acids Complex on Growth Performance and Serum Cu-Zn SOD Activity in Piglets. Pakistan J. Zool., 52: 1977-1984. DOI: https://dx.doi.org/10.17582/journal.pjz/20190304090325