00688naa#a2200169#i#450# EN\\bibl\11113 20250629020354.7 20231220b2023####ek#y0engy0150####ca RU ANALYSIS OF ECONOMICALLY USEFUL CHARACTERISTICS OF FIRST-BROWN HEIFERS DEPENDING ON THE AGE OF FIRST INSEMINATION Conference article/thesis Kazan TRIA FRC Kazan Scientific Center of RAS 2023 2 с. Conference article/thesis local Сельское хозяйство. Лесное хозяйство. Охота. Рыбное хозяйство. 63 Vasil'eva Mariya Grachev Vadim tatniva.editorum.ru