Authors
Józefa Krawczyk
Department of Poultry Breeding, National Research Institute of Animal Production, Kraków, Poland
Lidia Lewko
Experimental Station Kołuda Wielka, Waterfowl Genetic Resources Station in Dworzyska, National Research Institute of Animal Production, Kórnik, Poland
Jolanta Calik
Department of Poultry Breeding, National Research Institute of Animal Production, Kraków, Poland