The results of the different research method comparative efficiency to determine Holstein breed bullproducers prepotency are presented in the article. It is established that the methods of S.A. Ruzskiy, A.P. Soldatov, L.K. Ernst coincide in prepotency on milk yield by 95,8 %, fat mass fraction in milk - by 83,7 %, and the methods of N.A. Kravchenko, D.T. Vinnichuk respectively by 32,3 and 8,3 %.
black-and-white breed, Holstein breed, prepotency, milk yield, fat mass fraction in milk, statistical values
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