DOI 10.36461/NP.2024.69.1.012
UDC 636.052.78

REALIZATION OF GENETIC POTENTIAL OF STUD BULLS OF VARIOUS SELECTION
Berezkina G. Yu., Doctor of Agricultural Sciences, Associate Professor, Zakirova R. R., Candidate of Agricultural Sciences
Udmurt State Agrarian University, Izhevsk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it. , 8(3412)77-17-99.
Udmurt State University, Izhevsk, Russia, This email address is being protected from spambots. You need JavaScript enabled to view it. , 8(3412)916-116.

The materials of the article are devoted to the study of the realization of the genetic potential of milk yield, fat and protein content of bulls of various selection. The research was conducted in the leading breeding farms of the Udmurt Republic, where there is a high level of breeding accounting, in the period 2020-2022. Milk productivity was recorded once a month by control milking. To assess the genetic potential of stud bulls, the parent bull index was calculated. The chemical and physical properties of milk were evaluated according to the following indicators: the mass fraction of fat, the mass fraction of total protein, casein, nonfat milk solids, density and acidity were determined at the Department of Technology for processing livestock products in the Udmurt State University. The sanitary and hygienic properties of milk were determined by the following indicators: total bacterial contamination, thousand CFU / cm3, the presence of inhibitory substances, the number of somatic cells, thousand / cm3. According to organoleptic and physico-chemical parameters, the quality of cheeses was studied (the mass fraction of fat in CB, in %; moisture in %; milk consumption per 1 kg of cheese). The highest milk yield was from the mother of the mother of bulls of Leningrad selection (14,836 kg). The highest content of fat (4.36%) and protein (3.5%) in domestic selection animals was in the mothers of bulls in the Moscow selection. Among the stud bulls of imported selection, the mothers of German–bred bulls prevailed in terms of fat and protein content - 4.36 and 3.50%. When comparing the parent index of domestic and imported selection stud bulls for all analyzed characteristics, the RBI is higher in imported selection bulls. According to the level of realization of the genetic potential for milk yield in imported selection, the daughters of Dutch–bred bulls are distinguished - 48.7%. According to research, the most suitable milk for cheese production was obtained from the daughters of stud bulls of imported and Udmurt selection.
Keywords black-and-white breed, stud bulls, selection, genetic potential, suitability for cheesemaking.

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