Efficiency of the use of bulls of the Russian and imported selection of the breeding stock of the Red Steppe and Black-and-White breeds at the farms of the Omsk region

The possibilities of increasing the genetic potential of the breeding stock of dairy cattle by using the seed of stud bulls belonging to Russian organizations for artificial insemination of farm animals and the imported ones have been studied. The use of the Holstein breed bulls' seed of the Russian and imported selection on the breeding stock of the Red Steppe and Black-and-White breeds in the conditions of the Omsk region farms has been analyzed. The obtained results of researches have revealed the improving ability of stud bulls of the Russian selection, used on the breeding stock of the Red Steppe breed, on the main productive indices of the first and the highest lactation. The milk yield of the first heifers by 150 kg, or 2.4%, exceeded the productivity level of the imported root counterparts, the excess in fat and protein amounted to 0.1 and 0.08%, respectively. The coefficient of stability of lactation activity in this group of animals was maximum among the whole livestock – 92%. The superiority of imported rootstock animals on the main productive indicators has been identified on the breeding stock of the Black-and-White breed: milk yield (+769 kg), fat and protein content (+0.04 and +0.13%, respectively), milk fat and protein yield (+13 and +17%). Also, in the process of research the improving influence of the genetic potential of stud bulls of the imported selection on the whole breeding stock of the Red Steppe breed and on the breeding stock of the Black-and-White breed with the level of productivity of 8000 kg has been determined. The improving effect on the milk yield of the bulls of the Russian selection when they are selected to the breeding stock with the level of productivity up to 7000 kg has been found.