Reproductive qualities of breeding stock of cattle from different lines of black-and-white breed of Vologda type

The article presents the results of research on the reproductive qualities of the breeding stock of cattle belonging to different lines of the black-and-white breed of the Vologda type. Of the seven analyzed lines, heifers of the lines Vis Back Ideal 1013415, Montwick Chiftain 95679, Pabst Governor 882933 had optimal indicators. The age of the first insemination and their live weight at the first insemination were 15.4-18.6 months and 375-419 kg, respectively; wherein the animals of the agricultural production cooperative SPK “Stud Farm “Vologodskiy” were more precocious. The age of the first insemination and live weight at efficient insemination were slightly higher than at the first insemination and amounted to 15.1-19.1 months and 378-428 kg, respectively. The most optimal duration of the service period for the three lactations studied in the agricultural production cooperative SPK “Stud Farm “Vologodskiy” was possessed by cows of the lines Pabst Governor 882933 and Primus (95.3-115.0 days), by cows of the lines Vis Back Ideal 1013415 and Pabst Governor 882933 (86.5-110.3 days) in the integrated agricultural production company SKhPK collective farm “Peredovoy”, and by cows of the line Annas-Adema 30587 (104.0-114.6 days) in the agricultural production cooperative SPK (collective farm) “Plemzavod Prigorodnyy”. The duration of the dry period of cows in an individual farm differed slightly and was 38.5-66.1 and 60.3-69.0 days for 2 and 3 lactations in the agricultural production cooperative SPK “Stud Farm “Vologodskiy”, 60.0- 66.2 and 71.3-84.6 days in the integrated agricultural production company SKhPK collective farm “Peredovoy”, and 62.7-64.0 and 66.9-86.7 days in the agricultural production cooperative SPK (collective farm) “Plemzavod Prigorodnyy”. Against the background of the average indicators for the herd, the animals of the lines Vis Back Ideal 1013415, Montwick Chiftain 95679, Pabst Governor 882933 had better indicators.