| Summary: | In the paper we presented five-year investigations of numeric and structural changes in cattle karyotype on five farms and two centers for reproduction in Serbia. There were 371 breeding animals (215 male and 156 female), out of which 267 Holstein Friesian breed (193 male and 74 female), 62 Simmental (17 male and 45 female) and 42 Grey Steppe breed (5 male and 37 female). Cultivating of lymphocytes and karyotype analyses, according to the international standards for karyotypization of domestic animals, were applied. The aim of the investigation was to test genetic material on chromosome level of animals introduced into reproduction. The following changes were discovered in the karyotype: 6 animals of Holstein-Friesian breed were with chimeras 2n=60XX/XY and there was one Robertson's translocation in Simmental breed. Structural changes as breakage and a ring were discovered in two animals of Holstein-Friesian and Simmental breed raised in the area of bombing in Serbia. The animals of Grey Steppe breed had normal karyotype. There is a total of 9 animals with changes (2.42%), while 362 were with normal karyotype, total 97.57%. According to the results, it may be concluded that cytogenetical attestation of the breeding animals will have to be continued for the purpose of protecting the genofond on cattle farms.
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