TY CONF TI INFLUENCE OF COUMARIN ON THE CONTENT OF CHEMICAL ELEMENTS IN THE CHEST MUSCLES AND LIVER OF BROILER CHICKENS KW plant extracts KW coumarins KW phytobiotics KW animal husbandry KW antibiotics KW chemical elements JO XIII All-Russian scientific-practical conference of young scientists «Achievements and prospects of development of the Russian agriculture", dedicated to the memory of R.G. Gareev AU Klimova, T.. AU Duskaev, G.. PY 2023 PB TRIA FRC Kazan Scientific Center of RAS