Marking the cattle populations by individual genes and gene complexes createsnew opportunities for the development of selection when genetic methods aim to prevent the decrease of the populations’ gene variability. The article reveals the studies of the genetic structure of the Simmental cattle population, PAT breeding facility "Chervoniy Veleten" for erythrocyte antigens of 9 genetic systems (A, B, C, F, J, L, M, S, Z); linear affiliation of animals was taken into account. Animal erythrocyte antigens were determined by hemolysis reaction using monospecific sera - reagents. It is established that the spectrum of certain antigens is specific for Simmental cattle. The high frequency of antigenic factors G2, T2, E3/, G/, I/, O/, Q/, B// (q = 0,364 - 0,636) let us identify allele markers inherent in Simmental cattle: BGKE/G/O/Q/, BGKE/O/, BGO/, G2O2Y2, as well as OQ/, OI/Q/, TV /P/. The analysis of the of the most numerous factory lines (Neolit, Lavra, Zorkiy, Biser, Lascar) was carried out. It was shown that the markers of the Neolit line can be considered as the alleles: BOI'Q'(q = 0.2931) and BOTG`K` (q = 0.2392), Lavra - BBIA`K` (q = 0.1863) and BO` (q = 0.2500), Zorkiy - ВBGO` (q = 0.1325) and Вb, Biser - ВOI`Q` (q = 0.2246) and BG/ (q = 0.1920), Lascara - ВBGKE`GÒ `Q` (q = 0.1405) and BO` (q = 0.2735). It was found, that alleles EAB, which are more common for Laurel and Lascar lines (Kv=32.04%) are marked by the most similarities in the alleles of the EAB - blood group system, the highest values of the difference coefficient are characteristic of the Neolit - Lascar and Neolit - Laurel lines (55.66% and 54.86% respectively), the most differentiated was the Neolit line (Kv ser. = 49.48%, dser. = 0.332). Detection of interlinear differences in related groups of Simmental cattle allows preliminary prediction, correction and plan the animal selection for factory mating.
In order to determine the productivity of Simmental cattle population, genotyping of animals by genes associated with economically useful traits was carried out. The application of results in planning long-term selection and breeding work, considering genotypes of breeding bulls was proposed. Polymorphism of kappa-casein (κ-Cn), beta-lactoglobulin (βLG), leptin (LEP) and somatotropin (GH) genes in Simmental cattle population (The breeding facility “Krasniy Velikan”) was performed using of PCR-RFLP method. The level of productivity on milk yield, fat and protein content in milk was established. The combination of genotypes in the Simmental cattle population was determined on the basis of marking hereditary information by genes of quantitative traits to increase the productive potential of animals. In the studied population of Simmental breed polymorphisms were found to be polymorphic in all studied genes. The connection of controlled genes with indicators of animal milk productivity is established. Genotypes BB (κ-Cn), AA (βLG), BA (GH) and AB (LEP) were characterized by the highest rates of milk yield during the first lactation, genotypes AB (κ-Cn), AA (βLG), BA (GH) and AA (LEP) – the highest fat content in milk, genotypes AA (κ-Cn), BB (βLG), BA (GH) - the highest protein content in milk. The analysis of associative connections of the main productive traits of Simmental cattle with polymorphism of genes of kappa-casein, growth hormone, leptin and beta-lactoglobulin makes it possible to establish the most desirable complex genotypes: κ- to increase the fat content of milk, κ-CnAAGHBALEPAA / ABΒlgBA in selection to increase the protein content in milk. It is shown that in order to increase the productivity of Simmental cattle populations it is necessary to genotype breeding animals by genes associated with economically useful traits and apply the results when planning long-term plans for breeding work considering the genotypes of breeding bulls.
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