TY JOUR TI VARIABILITY STRUCTURE AND HERITABILITY OF THE HIGH FERTILITY CYCLE OF HOLSTEIN CATTLE IN THE NOVOSIBIRSK REGION KW service period KW high-fertility cycle KW heritability KW variability KW binomial model KW distribution fitting JO Bulletin of KSAU AU Shishkin, M.A. AU Kamaldinov, E.V. AU Palchikov, P.N. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University