The nonlinear PET model based on Newton's law of cooling can be used to estimate body temperature in cattle, T b challenged by hot cyclic chamber temperatures, T a • The PET model has four biologically meaningful parameters: K, the thermal constant; 1:1, the difference between T b and adjusted T a; r ' the proportion of variation in T b comparable to variation in T" ; T bini, the initial body temperature. The two parameters Y and L1 are highly correlated in the current version of the model.

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... study looks at other ways to parameterize the PET model in an effort to reduce the correlation between parameters and improve nonlinear behaviors, such as parameter-effects curvature, bias, excess variance and skewness.