POLYMORPHISM OF LEPTIN GENE AND ITS EFFECT ON INDICATORS OF MILK PERFORMANCE OF COWS

Abstract

The paper dwells on results of studies according to analysis of polymorphism of leptin gene and its effect on milk performance of cows of Holstein population of domestic selection. It was determined that LEPA allele frequency varied from 0.207 to 0.375, and LEPB allele - from 0.625 to 0.793. On average, a reliable relationship was determined in farms between the indicators of milk yield, content and yield of milk protein, and allelic variants of leptin gene: in animals of LEPAA genotype milk yield for 305 days of lactation exceeded by 4.3 % (P <0.01) and 4.7 % (P<0.01) the similar indicator of groups of cows with LEPAB and LEPBV genotypes, respectively; cows with LEPB allele in homo- or heterozygous forms, by 0.10-0.14 pp were inferior to the animals with LEPAA genotype in protein content and by 8.4 (P <0.001) - 7.3 % (P<0.01) in milk protein yield.