Abstract
The effects of polymorphism in the TG5 and LEP genes on meat productivity of Hereford and Limousin bull calves have been studied under the environmental conditions in the pre-Ural steppe zone. A significant dominance of the TG5C and LepA alleles is determined in the animals of both breeds; the distributions of frequencies of the genotypes for the TG5 gene are similar in character. The most common genotypes are TG5CC and TG5CT. The genotype frequency analysis indicates the considerable genetic potential of the animals for palatability and the nutritional values of meat, which is specified by the relatively high proportions of the TG5T allele and the desirableTG5TT genotype. The breed differences in the frequencies of genotypes for the LEP gene were ascertained as follows: the LEPAA genotype is predominant in the Hereford bull calves, while the relatively useful LEPAB genotype prevails in the Limousin bull calves. No significant relationship between the target TG5 and LEP SNP-genes and the animal growth rates was revealed.
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