TY JOUR TI THE ECOLOGICAL TOXICANT CONTENT IN THE TYUMEN REGION POULTRY PRODUCTS KW heavy metals KW poultry muscle tissue KW egg JO Bulletin of KSAU AU Gaevaya, E.V. AU Zakharova, E.V. AU Skipin, L.N. PY 2013 IS PB Krasnoyarsk State Agrarian University