Promising genealogical branches in the main lines of the Holsteinized black-and-white cattle population in the Vologda region

In modern populations of the Holsteinized black-and-white cattle, the genealogical structure is narrowed to two or three main lines on one side and the number of bulls is increasing within each line, on the other side. The current problem in genealogy complicates the work of breeders, who are to to reserve servicing bulls for the breeding stock of the herd. The research aim is to study the breeding and productive traits of animals belonging to various genealogical groups and to determine the most potentially productive genealogical branches in the modern population of Holsteinized black-and-white cattle of the Vologda region. The research material is presented by the data on 8951 breeding first-calf cows and 225 servicing bulls used in the Holsteinized black-and-white cattle population. The research base is formed by using the Information and Analytical System «Seleks. Dairy cattle», a multifarm version according to the 2021 bonus data. The present study has made it possible to found that the predominant number of first-calf cows (99.7%) belong to four genealogical lines of Holstein breeding - Vis Back Idial 1013415, Reflection Sovering 198998, Montwick Chieftain 95679 and Pabst Governer 882933. The potentially productive units have been identified by using a comparative analysis of the average milk yield of first-calf cows according to the genealogical branches of the main lines and the breeding value of the servicing bulls that represent these branches. The research has resulted in determination of nine potentially productive genealogical branches. The cows of the following genealogical branches give a higher average milk yield in the livestock: F.N. Boy 1806201 the Pabst Governer line 882933 by 586 kg of milk, E. Bell Elton 1912270 of the Montwick Chieftain line 95679 by 235 kg and the Prelude 392457 of the Vis Back Idial line 1013415 by 57 kg. The genealogical branches of T.M. Blackstar 1929410, R.T. Lidman 1983348, Manfred 2183007, M. Aerostar 383622, V. Chief Mark 1773417, Valiant 1650414 have a further development prospect due to the bulls that have a positive assessment of their breeding value for their daughter productivity.