Superovulatory response and embryo quality in Katahdin ewes treated with FSH or FSH plus eCG during non-breeding season.
Trop Anim Health Prod
; 51(5): 1283-1288, 2019 Jun.
Article
en En
| MEDLINE
| ID: mdl-30652251
ABSTRACT
The aim of this study was to evaluate the effect of a co-treatment of follicle-stimulating hormone (FSH) plus equine chorionic gonadotrophin (eCG) on serum insulin and insulin-like growth factor 1 (IGF-1) concentrations, superovulatory response, ovulatory rate, and number and production of embryos in Katahdin breed ewes during the non-breeding season. Twenty Katahdin ewes were synchronized with progestagens (CIDR) and assigned to two superovulation treatments (n = 10) (1) ewes treated with 200 mg ewe-1 of FSH from day 5 to 8 after CIDR insertion at decreasing doses every 12 h (FSH group) and (2) ewes treated as FSH group plus 300 IU of eCG on day 5 after CIDR insertion (FSH + eCG group). Estrous behavior was monitored and direct mating was performed. On days - 7 (CIDR insertion), 0 (CIDR withdrawal), and 7 (embryo recovery), blood samples were collected to determine serum hormone concentrations. Co-treatment with eCG (FSH group) did not affect (P > 0.05) serum hormone levels. Superovulation response, ovulation rate, recovery rate, fertilization, and number of embryos were also similar (P > 0.05) between treatments. Compared with FSH group, FSH + eCG ewes had lower (P < 0.05) number of transferable embryos and higher (P < 0.05) number of oocyte and a tendency to increase the number of degenerated embryos (P = 0.07). Overall results suggest that the administration of eCG is not beneficial either to improve the ovulatory response or the amount of transferable embryos in Katahdin ewes superovulated with a protocol using progesterone and FSH at decreasing doses.
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Bases de datos:
MEDLINE
Asunto principal:
Estaciones del Año
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Superovulación
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Gonadotropinas Equinas
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Transferencia de Embrión
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Hormona Folículo Estimulante
Tipo de estudio:
Guideline
Límite:
Animals
Idioma:
En
Revista:
Trop Anim Health Prod
Año:
2019
Tipo del documento:
Article