coefficient of correlation between THI at the day of
breeding and CR was r ¼ 0.49 (n ¼ 7252 inseminations;
P < 0.01). In the univariable logistic regression models, the
effect of THI thresholds from THI of 56 or more to THI of 76
or more on CR remained significant (Table 1). Odds ratios
decreased as THI increased, indicating a negative effect of
increasing THI on CR