TY JOUR TI Study of the effect of various additives on enzymatic processes in the rumen and the taxonomic composition of the microbiome KW sunflower oil KW ultrafine particles KW chromium KW digestibility KW volatile fatty acids KW nitrogen metabolism KW microbiome KW rumen KW ruminants JO Agrarian Bulletin of the AU Sheyda, E.V. PY 2022 IS 218 PB Ural State Agrarian University