TY JOUR TI Nuclear cytoplasmic maturation of Sus Scrofa Domesticus oocytes at ultralow temperatures KW oocyte KW embryo KW meiosis KW mitochondria KW intra- and extra-ovarian vitrification KW pig JO Agrarian Bulletin of the AU KUZMINA, T.I. PY 2024 IS 23 PB Ural State Agrarian University