Immunogenetic status and breeding value of Holstein cows

In the genealogical structure of breeding stock, highest specific weight is occupied by Reflection Sovering and Vis bek Aydiala lines, accounting for 56.8 39.9% animals, respectively. The study results Holstein cattle blood-group factors can be used to monitor its gene pool, genetic intrabreed differentiation, assess selection parameters, conduct targeted parental pairs. It was determined that in EAA blood group system cows reproduction from USA, frequency A1 antigen 58.7%, domestic this found with a lower 50.7%. At same time, specified groups both experimental “a” characterized frequency, lowest occurrence A2 antigen, animals took an intermediate position. EAB system, US have higher such antigens as Е3/, О3 и I1 compared reproductive Agro-Soyuz LLC. EAF represented two antigens, where F 100%. Of all systems, greatest differences between were detected EAZ system.