Productivity potential of introduced Holstein heifers

Identification of the productivity potential of Holstein cattle and the nature of implementation depending on paratypic factors and linear affiliation is relevant and is of scientific and practical interest. A comparative study of the productivity potential of introduced Holstein heifers, which was carried out in Agro-Soyuz LLC, Chegem District, Kabardino-Balkarian Republic, showed that differences due to linear affiliation were established between the groups of experimental animals. Among the mothers of heifers, higher milk yield values for 305 days of lactation were found in animals of the V.B.Aidiala 1013415 line, which exceeded their peers of the R.Soveringa 198998 line by 5.7% (P < 0.95). Higher milk fat content was found in cows of the R.Soveringa 198998 line mothers compared to the mothers of heifers of the V.B.Aidiala 1013415 line, which amounted to 0.14 abs.% (P < 0.95). Similar results were obtained in the study of milk protein content, i.e. the superiority of R.Soveringa 198998 line cows over V.B.Aidiala 1013415 line animals in terms of protein content in milk is 0.04 abs.% (P < 0.95). In general, the introduced Holstein heifers are characterized by a high genetic productivity potential, which varied in milk yield within the range of 10,621-11,073 kg, in butterfat content – 3.88-3.94%, in protein content – 3.19-3.2%. The maternal ancestors of the imported heifers of different lines were characterized by similar indicators of milk yield, butterfat content, although reliable differences were found in protein content in the groups of mothers of mothers and mothers of fathers.