The objective of the present study was to determine how some
common environmental factors affect IRT eye temperatures and to
document the relationship between IRT and rectal temperature in
cattle. The paper first looks at the relative distributions of IRT eye
temperature and rectal temperature in cattle and evaluates the
requirement of precision of the IRT eye temperature in order to
detect elevated body temperatures. Environmental parameters
such as camera to object distance, wind speed, and solar loading
were then examined to assess their effects on IRT measurements.