Abstract
Polymorphism analysis of DNA fragments flanked by (TC)9G and (CT)9G inverted dinucleotide microsatellite repeats in 766 animals of 19 cattle breeds and one breeding type revealed 66 fragments, of which 64 were polymorphic. The breeds proved to differ in the frequency and presence or absence of amplified DNA fragments at the genomic level, indicating that ISSR fingerprinting is informative for differentiating the PCR product spectra and cattle breeds. Multilocus ISSR polymorphism analysis identified the group of fragments that can be used as Bos taurus and B. indicus species markers to describe the standards of breeds, their genetic profiles, and breed-specific patterns. Based on ISSR polymorphism, a prototypal gene pool of cattle was constructed and the breeds closest to it were identified. Genetic diversity analysis made it possible to assume that an optimal mean heterozygosity is characteristic of cattle breeds and that deviations from this optimum are indicative of various processes occurring in the population (breed).
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