Wind speed in both live animals and using a surrogate ‘‘eye’’ was
found to decrease the IRT temperature. In the presence of 7 km/h wind, the mean IRT eye temperature
decreased by 0.43 ± 0.13 C and; at higher wind speeds (12 km/h), the temperature decreased by
0.78 ± 0.33 C. Direct sunlight was found to increase the IRT eye temperature by 0.56 ± 0.36 C. It was
determined that environmental factors impact IRT temperature measurements significantly and therefore
must be managed to ensure reproducible and accurate readings.