TY JOUR TI INSEMINATION PERIODS OF HIGHLY PRODUCTIVE COWS AFTER CALVING KW cycle KW index KW fertilization KW calving KW service period KW insemination KW involution JO Bulletin Samara State Agricultural Academy AU Baymishev, K.B. AU Eremin, S.P. AU Baimisheva, S.A. AU Petukhova, E.I. PY 2019 IS 4 PB Samara State Agricultural Academy