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*Corresponding author: Lidia Lewko, National Research Institute of Animal Production, Experimental Station Kołuda Wielka, Waterfowl Genetic Resources Station in Dworzyska, 32-065 Kórnik, Poland. E-mail: lidia.lewko@izoo.krakow.pl Received: 01 April 2019; Accepted: 22 May 2019 R E S E A R C H A R T I C L E

The effect of enzyme and protein source on laying hens performance, eggshell and bone traits