Heat tolerance index

A measure of the ability of certain animals to tolerate incoming solar radiation. Rauschenbach and Yerokhin(1975) proposed equations to calculate heat tolerance index (HTI) for three different species:
For cattle: HTI=1.2   −20d+52
For sheep: HTI=1.0 −20d+60
For pigs: HTI=1.4 −20d+44
is the air temperature (°C)
d is the difference between the rectal temperature measurements in the morning (0900 hours) and after noon (1500 hours). During this period, the animals remain exposed to direct solar radiation.

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