Heat tolerance in cows of British breeds and their crosses with bonsmara under grazing conditions

Abstract The objective of this study was to evaluate the influence of the increasing temperature-humidity index (THI) on the body temperature of cows from different breed groups. Vaginal temperature was monitored in cows from two breed groups: a) British breeds (Hereford, Angus and their crosses, n=4); and b) their crosses with Bonsmara (BO, n=6). Vaginal temperature in cows of British breeds was always higher (P