Kubiś, M., Lewko, L., Kaczmarek, S.A., Nowaczewski, S. and Andrzej Rutkowski, M.H. 2019. The effect of enzyme and protein source on laying hens performance, eggshell and bone traits. Emirates Journal of Food and Agriculture. 31, 5 (May 2019), 353–360. DOI:https://doi.org/10.9755/ejfa.2019.v31.i5.1953.