Abstract
The overall goal of this project is to evaluate the effect of the GnRH or estradiol benzoate (EB) administration at the beginning of the resynchronization protocol in Holstein cows without prior diagnosis. Thus, a total of 50 females will be divided into two groups: GnRH (n = 25) and EB (n = 25). After 25 days of the first fixed-TAI (D25) all the females will receive an intravaginal proge…