Аннотации:
© Published under licence by IOP Publishing Ltd. Dairy farming is striving to achieve positive results both in milk production increase and quality improvement. Unfortunately, the conventional breeding selection system does not consider the genotypic identity that reflects the level and direction of the processes occurring in the organism. The modern breeding selection is based on the selection by a set of features. In breeding, those animals that have more valuable characteristics are considered valuable. Animal husbandry can achieve great success only when analyzing the biology of the animal body and productivity. In order to increase the genetic potential of cows in Russia, it is necessary to take into account genetics and milk productivity. Analysis of milk productivity of cows with different LTF genotype in their pedigrees showed that the maximum milk yield was in cows of the Ayvengo line with the LTFAB genotype. These cows were distinguished from other cows by their high protein content, and these animals had the lactoferrin gene. And the animals of the Ayvengo line differed in the level of fat in milk. The comparative PCR-RFLP analysis of the blood DNA samples of the first-calf Holstein cows showed the benefit virtually by all milk production indicators (milk yield, milk protein and fat), including by somatic cell content in milk of the Ayvengo and Sovereign line cows with the LTFAB genotype. The Aydial line stock with the LTFAB genotype is worthy of notice regarding the selection activity.
