This study aimed at determining the association between reproductive indexes and total milk yield in non-planed lactations ≥600 days sub-fertile Holstein cows treated or not with recombinant bovine somatotropin (rbST) experienced prolonged hyperthermia. A of 1141 a single lactation were enrolled study: 622 rbST (control) 519 (500 mg every 14 throughout lactation). Across parities, control >4...