Synchronization of follicular wave emergence does not improve embryonic yield in superovulated ewes
Anim. Reprod.
; 18(4): e20210084, 2021. ilus, tab, graf
Article
en En
| VETINDEX
| ID: vti-765788
Biblioteca responsable:
BR68.1
Ubicación: BR68.1
ABSTRACT
The present study aimed to investigate the effects of a combination of progesterone with different doses of E-17β on following end points (1) ovarian follicular dynamics and emergence of a new follicular wave, and (2) superovulatory response and embryo yield. In Experiment 1, 28 ewes were randomly divided into four groups (n = 7) to receive either 2.0 mg, 1.0 mg, 0.5 mg or none E-17β one day after insertion of a progesterone device. The different doses of estradiol similarly delayed the moment of follicular emergence (overall mean = 3.1 ± 1.0 days vs. control group = 0.86 ± 1.0 days; P < 0.01), but the emergence of the new wave showed greater synchronization with the 0.5 mg dosage of E-17β. In Experiment 2, sixty-two donor ewes received an internal progesterone release device (day -1) for 7 d and 1 d after the insertion of this device (day 0) were allocated randomly to receive 0.5 mg of E-17β or only the vehicle (control group). Superstimulation was initiated on day 3 with the administration of 133 mg of pFSH in eight decreasing doses. Contrary to expectations, the protocol with the administration of 0.5 mg E-17β did not improve the percentage of donors with > 2 CL, the number of CL and the production of embryos (P > 0.05). It was concluded that the combination of progesterone and 0.5 mg E-17β was more efficient in synchronizing the emergence of the new follicular wave, however this approach seems to be unnecessary in ewes superovulation programs.(AU)
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Texto completo:
1
Base de datos:
VETINDEX
Asunto principal:
Superovulación
/
Ovinos
/
Estradiol
/
Sincronización del Estro
Límite:
Animals
Idioma:
En
Revista:
Anim. Reprod.
Año:
2021
Tipo del documento:
Article