Polymorphism of nucleolar organizer regions on the 8th pair of pig chromosomes

th pair of pig chromosomes was analysed. The relative size of silver stained NORs was measured in metaphasal plates of 30 animals. The relative size of silver stained NORs ranged from 0.102 to 0.188 m 2 in males and from 0.119 to 0.208 m 2 in females. The most frequently observed nucleolar organizer regions represented the third and the fourth size category (26.67% and 23.33% individuals, respectively).