Can roosters′ head ornaments serve as a criterion for their selection as a valuable reproducers?
Ewa Łukaszewicz, Paulina Bagińska, Martyna Lasoń
Freezability of Semen Collected from Ganders of 12 Breeds Covered by the Polish Genetic Resources Conservation Program
Ewa Łukaszewicz, Artur Kowalczyk, Anna Jerysz, Mirosław Lisowski