Abstract
Previous studies revealed that precisely quantified and normalized NORs size variants may be considered as chromosome markers helpful in pig breeds characterization and gene mapping. The aim of the present study was to identify and classify the NORs size variants as markers useful for genetic characteristics of Hampshire pigs. On the basis of cytogenetic and molecular analysis (carried out by Ag-I and FISH techniques) four size variants of FISH-signals and AgNORs deposits were classified. Nucleolar organizer regions were more morphologically distinct and greater on both chromosomes of pair 10 than on pair 8, which suggests a dominant role of chromosome 10 in the global production of ribosomal RNA. Results of cytomolecular survey of NORs size polymorphism can be used for inter-breed or inter-species comparative assays and phylogenetic studies in Suidae family.
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