In summary, the use of previously used NORG implants
during the synchronization of ovulation protocol
for TAI in beef heifers increases the occurrence of early
ovulation and exhibits a greater efficiency when TAI is
performed at 48 hours compared with 54 hours after
implant removal. However, when using a new NORG
implant, TAI can be performed either 48 or 56 hours after
implant removal with no detrimental effect on the P/AI in
beef heifers.