TY CONF TI EFFECTS OF PROLONGED EXPOSURE TO HEAT STRESS ON HOLSTEIN COWS OF DOMESTIC AND FOREIGN SELECTION DEPENDING ON ZOOHYGIENIC CONDITIONS OF MAINTENANCE KW cattle KW heat stress KW zoogygiene KW dairy cattle KW housing system JO XIV All-Russian Scientific and Practical Conference of Young Scientists “Achievements and Prospects of Development of the Agroindustrial Complex of Russia” with international participation, dedicated to the 300th anniversary of the Russian Academy of Sciences. AU Muhanina, E.. AU Safina, N.Y. AU Gaynutdinova, E.R. AU Shakirov, S.K. PY 2024 PB TRIA FRC Kazan Scientific Center of RAS