Immunogenetic indicators in Simmental cattle breeding

Immunogenic analysis allows to identify the genetic effect of individuals on the total gene pool of the herd and the formation of the allele pool in certain groups of animals. Of great importance is the use of data on blood types when breeding livestock along the lines, when significant genetic similarity is created within the entire population. Studies of Simmental cattle were conducted in 1995-2011. According to the results of the analyzes in the breeding herds of the “Combine” farm and the “Abodimovskiy” farm of the Saratov region, 15 of the most frequently encountered B-system alleles were identified. Comparative analysis of alleles showed that B-alleles B 2 G 2 KE' 1 O' (12.4%), O 1 I'Q' (15.2%), O 3 QA' 2 E 1 J 2 (25.3%) are the most characteristic for the main lines and the herd as a whole. However, in the herd there are alleles that are not found in other zones - B 2 O 1 Y 2 D' - (2.3%), B 2 O 3 Y 2 A' 2 E 2 P' 2 Q' - (2.1%), I 1 E' 2 G"- (2.1%), Y 2 A' 1 D'E' - (1.0%). This indicates that the studied group represents a kind of population that can be attributed to the Volga zonal type. Genetic affinity between the lines, groups of bulls, families was determined on the basis of the genetic similarity index (r). An index of up to 0.5 is considered to indicate a significant genetic dissociation of the compared groups of animals, up to 0.80 - of the existing genetic differences, with above 0.80 - for the presence of genetic similarities between the compared groups of livestock. The calculations showed that there is a genetic similarity between the cows of the Florian and Fasadnik lines, as well as the Facadnik and Mergel, in the herd of the “Combine” state farm (the index value was 0.89 and 0.91) The differences were established between the animals of the Florian and the Mergel lines (r = 0.76). The high genetic similarity between the lines is due to the use of crosses between them. The homozygosity coefficient in the lines varies from 9 to 22%.