TY JOUR TI REVIEW OF THE "PROVETIN FOR POULTRY" AND "KLYUVER PRO+" FEED ADDITIVES EFFICACY IN LIVESTOCK FARMING KW feed additives KW bacillus subtilis KW kluyveromyces marxianus KW productivity KW livestock farming JO Vestnik of Omsk SAU AU GAYFULLIN, R.R. PY 2026 IS 61 PB FSBEI HE Omsk SAU