UDC 636.2.082.25:636.237.21
DOI 10.36461/NP.2023.65.1.009
THE INFLUENCE OF STUD BULLS ON THE ECONOMICALLY USEFUL SIGNS OF DAUGHTERS
T.V. Shishkina, Candidate of Agricultural Sciences, Associate Professor; E.A. Zykina, Candidate of Agricultural Sciences; N.V. Nikishova, Candidate of Agricultural Sciences, Associate Professor; T.A. Guseva, Candidate of Agricultural Sciences
Federal State Budgetary Educational Institution of Higher Education "Penza State Agrarian University", Penza, Russia, vol. 8(8412) 628380, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Studies on the evaluation of stud bulls by the quality of offspring were carried out on purebred animals of the Holstein breed in the conditions of the dairy complex of OOO "Pachelma farm" OP "Serdobskoye". The daughters of the three bulls Lotto, Gotham and Wormont were subject to evaluation. As a result of the conducted research, it was found that the animals of all the evaluatedstud bulls have a high assessment of the exterior and meet the breed standard by physique type. The obtained results indicate the absence of a reliable influence of stud bulls on the reproductive properties of heifers and live weight indicators. A significant difference was noted only in the size of the live weight of the Wormont daughters, in comparison with the live weight of the daughters of other bulls. As a result of the use of sexed semen in the group of heifers born from the Gotham daughters, there were more than from the Lotto and the Wormont daughters, respectively, by 6 and 11%. The higher yield of heifers was observed in the Lotto daughters (80%), and the lowest in the Wormont daughters. The Lotto and the Gotham daughters had 10.9% more of an average yield of heifers than the Wormont daughters. The daughters of all bulls have a decrease in the milk yield for the third lactation in relation to the first lactation. The Lotto daughters reduced milk yield by 539.2 kg or 4.88%, the Gotham daughters – by 518.4 kg or 4.7%. The Wormont daughters – by 252.6 kg or 2.7%. Animals in the second lactation exceeded cows in milk yield for the third lactation. This superiority was 3024.1 kg or 22.3% in the Lotto daughters, 2900.6 kg or 21.6% in the Gotham daughters, 80 kg or 0.89% in the Wormont daughters. In general, the Lotto daughters are the best in terms of milk productivity.
Keywords: stud bulls, Holstein breed, milk productivity.
