TY CONF TI PRODUCTIVE QUALITIES OF COWS DEPENDING ON COMPLEX GENOTYPES FOR BETA-CASEIN AND LEPTINA GENES KW black-and-white cattle KW polymorphism KW genotype KW beta-casein KW leptin KW milk yield KW qualitative composition of milk. 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 Paramonova, M.. AU Valitov, F.. AU Kononenko, T.. AU Ganieva, I.. PY 2023 PB TRIA FRC Kazan Scientific Center of RAS