Muji, S., Kryeziu, A., Kamberi, M., Kastrati, R. and Mestani, N. 2019. The Excretion of Ca, Mg, Zn and Cu Through Excreta of Laying Hens Fed Two Different Levels of Protein with and without Phytase. Turkish Journal of Agriculture - Food Science and Technology. 7, 1 (Jan. 2019), 68–72. DOI:https://doi.org/10.24925/turjaf.v7i1.68-72.2111.