TY CONF TI THE MILK YIELD OF HOLSTEIN BREED OF COWS AFTER FIRST CALVING KW Holstein breed; first-calf cows; milk yield KW fat and milk protein JO SCIENTIFIC SUPPORT FOR LIVESTOCK BREEDING IN SIBERIA AU Zelenina, O.V. PY 2024 PB Krasnoyarsk Scientific Research Institute of Agriculture is a separate division of the Federal Research Center KSC SB RAS