Genealogical structure and evaluation of Holstein breeding bulls

The Holstein bulls’ genealogical structure on the Russian Federation breeding enterprises (n= 3 75), as well selection types ratio of their breeding, genomic parameters’ assessments in countries exporting were studied. evaluation 21 sires daughters quality and mothers milk production comparison plant’s herd was carried out. A narrow range lines imported Holsteins, that does not allow genetic variability’s effective use at domestic livestock populations improvement, has been identified. These bulls by offspring revealed distribution yield terms mass fraction protein (PC) but with fat (FC) decreasing relative to groups mothers. determination daughter groups’ repeatability coefficients ranking based characteristics significant differences values estimated fortheir fathers: for rs = 0,395, PC — =0,200, FC – 0,570. author concludes it is impossible plan improvement ofthe main features selecting according assessment indicators’ levels givessuggestions improvment methodology evaluating dairy cattle Federation.