Furthermore, the present study aimed to evaluate the
timing of TAI (48 or 54 hours after NORG implant removal)
according to the number of uses of the NORG implant (new
or previously used for 9 days) on ovarian follicular dynamics
(experiment 1) and pregnancy per AI (P/AI; experiment
2) in cyclic beef heifers. The hypothesis is that the
optimum time to perform TAI depends on the NORG
implant (new or used) used for the estrus synchronization
protocol in beef heifers.