2020-01-272020-01-272020-01-272008-11-301982-0151http://localhost:8080/handle/prefix/883This case report aims to present the pregnancy rate obtained with the use of a protocol for synchronizing the wave of follicular growth and ovulation in calving Nellore cows for the use of artificial insemination in fixed time (IATF), with this treatment seeks to reduce the postpartum anestrus. For this, 70 cows calved between 45 and 60 days postpartum were used, the protocol was based on the placement of an intravaginal progesterone device and administration of estradiol benzoate, 8 days after the device was removed and prostaglandin F2 and FSH were applied. , the next day another BE application was performed. IATF was performed 24 hours after the end of treatment. The pregnancy diagnosis was carried out 45 days. Pregnancy rates of 43.3% were obtained at the IATF and 80.6% after the transfer of bulls. The reproductive efficiency in a Nelore cattle breeding can be increased with the use of IATF protocols, seeking the fertilization of cows up to 100 days postpartum.Acesso AbertoMedicina VeterináriaVacas: pós partoAnestroIATF: inseminação artificial em tempo fixoCNPQ::CIENCIAS AGRARIASArtigo de Evento