Association of ?-lactoglobulin gene polymorphism with biochemical parameters of blood and qualitative composition of milk of Holstein cattle

The ?-lactoglobulin (BLG) gene, which is responsible for the biological value indicator that affects ratio of protein fractions, level composition and technological characteristics milk presents considerable interest dairy cattle breeding. purpose our work was to identify relationship with polymorphism beta-lactoglobulin gene biochemical blood parameters productivity Holstein cattle. This research carried out in 2020-2021 on 148 cows Integrated Agricultural Production Centre “Stud farm named after Lenin” Atninsky district Republic Tatarstan. As an effect studies, it shown animal herd polymorphic gene. Population represented by three genotypes: AA - 24.3, AB 47.3 BB 28.4%. frequency occurrence alleles A B 0.480 0.520, respectively. In group animals genotype BLG serum detected increased content indicators metabolism (total protein, albumin, ALT) minimum urea. Cows whit genotypes are characterized mass fraction fat MSNF (milk solids non-fat) dry matter. supported FASO Russia project number: 122011800138-7.