TY JOUR TI THE EVALUATION OF THE INDICATORS OF SPERMOPRODUCTION OF BULLS-PRODUCERS WITH DIFFERENT LEVEL OF BIOELECTRIC POTENTIAL OF BIOLOGICALLY ACTIVE CENTERS AND IN DIFFERENT SEASONS OF A YEAR KW spermoproduction KW bulls-producers KW biopotential KW superficially localized biologically ac- tive centers JO Bulletin of KSAU AU Samusenko, L.D. AU Mamaev, A.V. AU Konovalov, K.V. PY 2019 IS PB Krasnoyarsk State Agrarian University