TY JOUR TI MORPHOFUNCTIONAL CHARACTERISTICS OF MUSCULAR MUCOSA OF THE MULARD BREED DUCK STOMACH OF 6 MONTHS AGE KW duck KW histology KW stomach JO Bulletin Samara State Agricultural Academy AU Sadchikova, O.V. AU Lapina, T.I. PY 2017 IS 2 PB Samara State Agrarian University