Hu Liu, Qifang Yu, Xiaopeng Tang, Chengkun Fang, Sijia Chen and Rejun Fang, 2020. Effect of Selenium on Performance, Egg Quality, Egg Selenium Content and Serum Antioxidant Capacity in Laying Hens. Pakistan J. Zool., 52: 635-640. DOI: https://dx.doi.org/10.17582/journal.pjz/20190424040448