breeding on CR was determined by the relationship
described graphically and the B slope resulting from the
univariable logistic regression model. An increase in the
THI threshold was associated with a continuous decline in
the CR. The fitted line between THI threshold and CR was
approximately linear above THI threshold of 73 (Fig. 2)
indicating that the fitted effect of each incremental THI
threshold was constant and additive [23]. In the univariable
logistic regression, B slope started to decrease