00561naa#a2200157#i#450# EN\URAL'SKIY GOSUDARSTVENNYY AGRARNYY UNIVERSITET\bibl\42174 20240507002502.2 1997-4868 20210203b2021####ek#y0engy0150####ca RU Changes in the indicators of own productivity of Holstein bulls depending on the season and age Journal article Ekaterinburg Ural State Agrarian University 2021 8 с. Journal article local Naryshkina Elena Nikolaevna usau.editorum.ru