TY CONF TI APPLICATION OF METHODOLOGY FOR CONSTRUCTING SELECTION INDICES TO OPTIMIZE THE SELECTION OF ANIMALS BY A COMPLEX OF CHARACTERISTS KW selection index KW assessment of breeding value KW cattle KW milk productivity KW reproduction KW productive longevity KW pigs KW fattening productivity KW feed conversion KW feeding behavior. 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 Otradnov, P.. PY 2023 PB TRIA FRC Kazan Scientific Center of RAS