Biological characteristics of Brown Caucasian cattle breed have been studied in the course of research and production operations at a farm located in Khornabuji village, Sighnaghi district of Kakheti. The research aimed at identifying physiological and clinical characteristics of cattle placed in thermally neutral and extremely high temperature conditions. Caucasian Brown is a local breed, developed through crossbreeding with Brown Swiss. Grown cows of Caucasian Brown weigh 400-450 kg, yield is 2500-4000 kg of milk with fat content of 3.8-3.9%. THI values often were 79STHIS 84, posing potentially serious hazard to livestock health. In spring 2016, 100 heads of Holstein calves were imported from Estonia to LLC Shtori, which is used as a research site. The farm uses innovative intensive farming technologies and is located in Pshaveli village, Telavi district, Kakheti Region.