THE IMPACT OF THE STUD RAMS’ GENOTYPE ON THE NUMBER OF CHROMOSOMES IN THE OFFSPRINGS’ CELLS

Abstract

The paper demonstrates the research results on somatic chromosomal instability that includes the number of chromosomal fragments in the blood cells of the ram descendants, obtained from Romanov servicing rams. The research was carried out on the populations of Romanov sheep at OAO “Vaganovo” in Promyshlennovsky district of the Kemerovo region. The samples were prepared by means of the P. Murkhed method and stained using the Romanovsky-Gimza method. 2580 metaphase blood plates of lambs were studied. The authors analyzed the environmental situation in the breeding area. Studies of soil, fodder, organs and tissues of the animals of different species confirm that there are no heavy metal pollution within the sanitary protection zones in Western Siberia. The authors found out the hereditary regularities of somatic chromosomal instability in the Romanov sheep. The researchers identified the impact of servicing rams genotype on the quantity of fragments of chromosomes in the blood cells of the offspring. The differences in phenotypic variability were revealed in the offspring of different ram-males. The paper shows that the number of chromosome fragments in the sons of some fathers was 3.2 times higher than in the descendants of other servicing rams. Due to the lack of the data on somatic chromosomal instability, the number of chromosomal fragments in the cells of Romanov sheep in Siberia, the data obtained can be accepted as a physiological standard, as well as used to characterize animal interior.