Association of κ-casein, β-lactoglobulin, α-lactalbumin and leptin gene polymorphisms with bovine productivity traits in Western Siberia

¹ Novosibirsk State Agrarian University, Dobrolyubova str., 160, Novosibirsk, 630039, Russia
² Siberian Federal Research Cantre for AgroBiotechnology, RAS, Krasnoobsk, Novosibirsk region, 630501, Russia

^* Corresponding author: unzhackova2017@yandex.ru

Abstract

The Simmental breed (n=182) and Siberian breed (n=131) cows were genotyped using the CSN3, BLG, LALBA, and LEP genes. In both populations, the frequency of homozygotes did not exceed 10 %, and the proportion of heterozygotes was at the level of 40-45%. The actual genotype distribution corresponded to the theoretically expected Hardy-Weinberg distribution. In terms of milk yield, cows of the «Sibiryachka» breed with the BLG^AA genotype significantly outperformed cows with the BLG^BB genotype (p<0.05), and in the Simmental breed, cows with the BLG^AA genotype had a higher milk yield than BLG^AB (p<0.01). According to the LALBA gene in the Simmental breed, cows with the LALBA^BB genotype were superior to cows with LALBA^AA in fat content (p<0.05), in the «Sibiryachka» breed, higher fat content was observed in cows with the LALBA^AB genotype (p<0.05). In both breeds, cows with the LEP^CC genotype outperformed cows with the LEP^TT genotype in fat content (p<0.05). According to the reproduction indicators, cows with the LALBA^AA and LEP^CT genotypes had an earlier age of insemination in comparison with cows with the LALBA^BB and LEP^CC genotypes (p<0.05). Cows with the LEP^CT genotype had a longer calving interval than cows with the LEP^CC genotype (p<0.05).