Participation of individual chromosomes in constitutive cytogenetic abnormalities of cattle

The purpose. To study participation of individual chromosomes in constitutive cytogenetic abnormalities of cattle. Methods. Cultivation of lymphocytes, preparation of cytogenetic specimens. Grading and the record-keeping aberrations of chromosomes was realized under practical standards. Results. The frequency of participation of individual chromosomes in chromosomal rearrangement were studied. It was found that the most frequently happening chromosomal breaks were the following: 20.0% for the first chromosome, 16.0%, for the second one, 8.5% and 7.0% for the thirteenth and the twenty-first chromosomes accordingly. The breaks occurred in places between euchromatin and heterochromatin chromosome segments, as it was displayed by the results of differently colored samples analysis. Conclusions. The gained experimental data testify to the following: frequency of participation of individual chromosomes in constitutive cytogenetic abnormalities can be used as an index of non-specific destabilization of the chromosomal apparatus of animals.