Your browser doesn't support javascript.
loading
Strategies to increment in vivo and in vitro embryo production and transfer in cattle.
Bó, Gabriel A; Cedeño, Andrés; Mapletoft, Reuben J.
Afiliação
  • Bó GA; Instituto de Reproducción Animal Córdoba (IRAC), Zona Rural General Paz, (5145) Córdoba, Argentina.
  • Cedeño A; Instituto de Ciencias Básicas, Medicina Veterinaria, Universidad Nacional de Villa María, Villa del Rosario, Córdoba, Argentina.
  • Mapletoft RJ; Doctorado en Ciencias Mención Agroalimentos, Universidad Nacional de Villa Maria, Villa del Rosario, Córdoba, Argentina.
Anim Reprod ; 16(3): 411-422, 2019 Oct 23.
Article em En | MEDLINE | ID: mdl-32435285
Knowledge of follicular wave dynamics obtained through the use of real-time ultrasonography and the development of the means by which follicular wave dynamics can be controlled have provided practical approaches for the in vivo and in vitro production and transfer of embryos in cattle. The elective control of follicular wave emergence and ovulation has had a great impact on the application of on-farm embryo transfer, especially when large groups of donors need to be superstimulated at the same time. Although estradiol and progestins have been used for many years, practitioners in countries where estradiol cannot be used have turned to alternative treatments, such as mechanical follicle ablation or the administration of GnRH for the synchronization of follicle wave emergence. In vitro embryo production also benefits from the synchronization of follicle wave emergence prior to Cumulus Oocyte Complexes (COCs) recovery. As Bos indicus cattle have high antral follicle population, large numbers of oocytes can be obtained by ovum pick-up (OPU) without superstimulation. However, synchronization of follicular wave emergence and superstimulation is necessary to obtain high numbers of COCs by OPU and blastocysts following in vitro fertilization in Bos taurus donors. Finally, embryos can now be transferred in commercial beef or dairy herds using efficacious synchronization and re-synchronization protocols that are easily implemented by farm personnel. These technologies can also be used to resolve reproductive problems such as the reduced fertility observed during summer heat stress and/or in repeat-breeder cows in commercial dairy herds.
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Anim Reprod Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Argentina País de publicação: Brasil

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Anim Reprod Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Argentina País de publicação: Brasil