Use of genetic resources of brown Swiss breed cows

One of the most important conditions for increasing milk production is the qualitative improvement of existing breeds; this is achieved through the extensive use of the best domestic and world genetic resources. The article discusses the results of the analysis of milk productivity, the strength of the influence of the factor "fattening for the first lactation" on the productivity of daughters of different genotypes according to zoo technical and breeding records. 3 groups of animals of the brown Swiss breed were formed: 2 pedigree (OSH+BSHA), 3 pedigree (OSH+BSHA+J) and domestic Swiss (OSH). According to the results of the study, it was determined that cows with the genotype of the brown American breed (OSH+BSНA) have a significant advantage in milk yield for the first lactation of 243-419 kg of milk, in fat 9-19 kg (p≤ 0.001). For the third lactation 323 kg of milk, fat 15 kg (p≤ 0.01), and the highest 116 kg-237 kg (p≤ 0.05), fat 11 kg (p≤ 0.01). Cows of the group had the highest protein-milk content, milk content ratio, exceeding the 3 breeds cows by 65 kg (p ≤ 0.001), 28 kg (p≤ 0.01), 35 kg (p ≤ 0.001), OR by 123 kg (p ≤ 0.001), 55 kg (p≤ 0.05), 44 kg (p ≤ 0.001). With targeted breeding, the milk yield was increased, and the quality indicators of milk fat and protein were improved. The results of the analysis of variance confirm the influence of milk yield for the first lactation on productivity during the subsequent use of cows.