Authors
Antoni Polonis
Department of Animal Hygiene and Environment
Jerzy Lechowski
Department of Pig Breeding and Production Technology, Faculty of Biology and Animal Breading, University of Life Science in Lublin, Lublin, Poland
Leszek Tymczyna
Department of Animal Hygiene and Environment
Ryszard Borowski
Groups of Agriculture Counseling in Zamość with headquartes in Sitno, Sitno, Poland
Katarzyna Gizińska
Groups of Agriculture Counseling in Zamość with headquartes in Sitno, Sitno, Poland