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Jadwiga Topczewska
Department of Animal Production and Poultry Products Evaluation, Faculty of Biology and Agriculture, University of Rzeszow, Zelwerowicza 4, 35-601Rzeszów, Poland
Wanda Krupa
Department of Ethology and Technological Basis of Animal Production, Faculty of Biology, Animal Sciences and Bioeconomy, University of Life Sciences in Lublin, Akademicka 13, 20-950Lublin, Poland