Abstract
Kendall (1948) suggested that the ability of cattle to thrive in tropical regions could be better indicated by the diurnal variation in body temperature rather than actual body temperature. However, Bligh & Lampkin (1965) found little difference in the nychthemeral variation in deep-body temperature of East African Zebus and Herefords grazing under conditions where the atmospheric shade temperature varied from 71 to 40 °F.