TY JOUR TI THE EFFECTIVENESS OF THE USE OF EGG CROSSES OF DOMESTIC BREEDING IN ROSTOV REGION KW chickens KW cross KW safety KW uniformity KW fabriciana bag KW thymus KW spleen KW egg production KW quality of eggs JO Bulletin of KSAU AU , .. AU , .. AU , .. AU , .. AU , .. PY 2016 IS PB Krasnoyarsk State Agrarian University