Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 23 ISSUE 4
Written by Volodymyr LADYKA, Yuriy SKLIARENKO, Yuliia PAVLENKO, Viktoriia VECHORKA, Alona MALIKOVA

The study of polymorphism of beta-casein genes CSN2 and kappa-casein CSN3 in cows of Brown cattle, Simmental breed, Black and White cattle has been carried out with the use of polymerase chain reaction in real time. It is shown that the frequency distribution of CSN2 / CSN3 composite genotypes differs significantly in different breeds: Brown cattle – 22.0 А1А2/AB, 22.7% А2А2/AB and 22.0% А2А2/BB; Simmental – 26.8% А1А2/AB; А2А2/AF, 22.0%, А2А2/AB 19.5%; Black and White cattle – 26.9% А1А2/AA; А1А1/AB, 23.1%, А2А2/AA 23.1%. The obtained results indicate the prospects of breeding work concerning the formation of herds (micropopulations) by the A2A2/BB composite genotype, which is only possible among Brown breeds. This makes it possible to increase the effectiveness of measures to preserve the population of Brown cattle by improving the quality of their milk.

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