Dairy productivity of Kostroma cows of complex genotypes GH/PRL

At the present stage of the development of dairy cattle breeding, the introduction of the practice of genomic breeding of cattle has significantly improved such an important quantitative feature as milk production. At the same time, marker breeding is a powerful tool for the development of dairy cattle and increasing economic efficiency of the industry. In recent decades, this industry has been undergoing significant changes due to technological progress, which in practice makes it possible to increase production rates. Among different breeds of local breeding, the Kostroma cattle breed is one of the best breeds of combined productivity in the Russian Federation, due to its potential for high milk productivity and increased adaptive abilities. In this regard, the study of local herds of small breeds using modern achievements of marker breeding is an urgent task for the preservation and further improvement of breeds. The purpose of the study was to examine milk productivity of Kostroma cows of complex genotypes GH/PRL. The research was carried out on breeding cows of the Kostroma breed (n=82) at the herds of the collective farms «Rodina» and «Gridino». As a result of molecular genetic testing, the dynamics of higher milk yields in GHLLPRLAA and GHLLPRLAB carrier cows was established (5407±114.65 and 5550±174.25 kg, respectively). At the same time, higher protein milk content was recorded in cows with the GHLLPRLAA genotype, surpassing GHLLPRLAB and GHLLPRLBB by 0.05 and 0.02% (P function show_eabstract() { $('#eabstract1').hide(); $('#eabstract2').show(); $('#eabstract_expand').hide(); }