Abstract
The article presents data on the features of polymorphism of the CAST, GH and GF 9 genes in Kalmyk sheep of the short-tailed breed and crossbreeds with a bloodline of 1 Kalmyk short-tailed + 1 dorper. The polymorphism of the GDF9 gene in the Kalmyk chicken breed is represented by GDF9A alleles with a low frequency of occurrence (0.17) and with a high frequency of occurrence (0.83) GDF9G. In the identified polymorphism of crossbred animals (½ Kalmyk fat-tailed + ½ dorper), the G allele for the GDF9 gene is the most common, the frequency of occurrence of which was 0.74. Heterozygous AG genotype was common in the studied sheep population (52.9%). The obtained results of the study and their analysis indicate the diversity of the distribution of the allele profile in the loci of the studied genes.
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