Compliance with the forecast assessment of breeding bulls abroad and in terms of offspring quality in the Vologda Region

The research was conducted to determine the compliance of the predicted assessment of the breeding value of 22 imported bulls according to data from foreign organizations and to assess their offspring quality in breeding farms in the Vologda Region. The assessment of the quality of offspring by the “daughter–peer” method was calculated based on the productive characteristics of 1,502 Holstein cows of the 1st calving of the Russian Black Pied cattle. The research sample included bulls with at least 15 daughters. An analysis of the genealogical affiliation of the bulls presented in the research sample showed that they belong to two genealogical lines of Holstein breeding: 7 – to the line of Vis Back Ideal 1013415, 15 – Reflection Sovering 198998. As a result of studying the predicted capacity for dairy productivity calculated in the USA, it was revealed that almost all producers included in the study have a positive PTAM index, which ranges from +5 kg to +1,038 kg. Only one bull Altacaint 108253944 has a negative PTAM value of -386 kg. When calculating the assessment of the quality of offspring, the orientation of the influence on the birth of daughters was confirmed in 68.2% of the bulls studied. There is also a difference in the value of PTAM indicators and the breeding value of bulls by offspring, which varies from -1,327 kg to +500 kg. The predictive assessment of the influence of fathers on the level of the mass fraction of fat and protein in the milk of daughters was confirmed when assessing the quality of offspring from 11 producers or 52.3% of the number of bulls studied. The research results confirmed the need to evaluate foreign producers in the context of domestic populations of dairy breeds. They can be used by specialists of farms in the selection and consolidation of producers of foreign breeding for the breeding stock of herds and will increase the efficiency of breeding work with populations of dairy cattle.