TY JOUR TI THE EFFICIENCY OF MASS SELECTION OF SOWS OF BREED LANDRAS ON REPRODUCTIVE QUALITIES KW Landrace breed KW line KW family KW multi-ple fetation KW the number of piglets and mass of sockets in 30 days JO Bulletin of KSAU AU Kakhikalo, V.G. AU Nazarchenko, O.V. PY 2017 IS PB Krasnoyarsk State Agrarian University