TY JOUR TI THE DEPENDENCE OF EGG PRODUCTION OF LAYING HENS ON THE COMPOSITION OF ENZYME PREPARATIONS KW enzyme preparations KW amilosubtilin KW CelloLux KW protosubtilin KW feed KW feeding rate KW egg production KW egg weight. JO Vestnik of Kazan State Agrarian University AU Ivanova, E.. AU Lavrentev, A.. PY 2014 IS 9 PB Kazan state agrarian University