Генетическая структура коров черно-пестрой породы по лактопротеинам
2020
Луполова, T. (Mozyr State Pedagogical University named after I. P. Shamyakin, Mozyr (Republic of Belarus)
Systematic genetic monitoring in populations allows to control the level of genetic diversity, to use the capabilities of marker selection, including the assessment of intra-breed differentiation, the formation of an optimal genealogical structure and selection for heterosis. The article provides information about the genetic structure of the populations of Belarusian Black-and-White cows at the lactoprotein loci CSN3, LALBA, BLG. In two farms at the LALBA, BLG loci, the most frequently encountered (from 42% to 51%) is the heterozygous genotype AB. At the CSN3 locus AA homozygotes were predominant (65% – 72%). Alleles had an almost equal frequency – 61% and 62% for LALBAA and 39% – 38% for LALBAB. The frequencies CSN3A and CSN3B had almost the same values – 0.806 – 0.853 and 0.194 – 0.147, respectively. In genetically equilibrium (χ2 <3.84) cow populations, the occurrence of the BLGA allele was 0.549 and 0.486, BLGB – 0.451 and 0.514. The average heterozygosity is determined at the level of 39.6% – 43.4%.
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