Authors
Lidia Lewko
National Research Institute of Animal Production, Experimental Station Kołuda Wielka, Waterfowl Genetic Resources Station in Dworzyska, Kórnik, Poland
Ewa Gornowicz
National Research Institute of Animal Production, Experimental Station Kołuda Wielka, Waterfowl Genetic Resources Station in Dworzyska, Kórnik, Poland
Marian Pietrzak
Poznan University of Life Sciences, Department of Small Mammals Breeding and Animal Origin Materials, Poland
Waldemar Korol
National Research Institute of Animal Production, National Laboratory for Feedingstuffs, Lublin, Poland