TY JOUR TI DYNAMICS OF THE QUALITY OF COW COLOSTRUM DEPENDING ON THE TIME OF THE FIRST MILKING AFTER CALVING KW breed KW cow KW colostrum KW immunity KW composition KW immunoglobulins KW chemical JO Bulletin Samara State Agricultural Academy AU Bakayeva, L.N. AU Karamaev, S.V. AU Karamayeva, A.S. PY 2019 IS 4 PB Samara State Agrarian University