Potential role for GnRH in the synchronization of follicular emergence before the superovulatory Day 0 protocol

Domestic Animal Endocrinology
M F A BalaroF Z Brandão

Abstract

The ability of gonadotropin-releasing hormone (GnRH) to synchronize ovulation and new follicular wave emergence before a "superovulatory Day 0" protocol was assessed in Santa Inês ewes. For estrus synchronization, a 60-mg medroxyprogesterone acetate sponge was inserted for 6 d. One day before sponge removal, 37.5-μg d-cloprostenol and 300 IU equine chorionic gonadotropin were injected intramuscularly (i.m.). After sponge removal, ewes were assigned to the following 3 groups: (1) GC-1 mL saline at 12 h (n = 10); (2) G24h-0.025-mg lecirelin (GnRH agonist) i.m. at 24 h (n = 10); or (3) G36h-0.025-mg lecirelin i.m. at 36 h (n = 9). Ovarian ultrasonography was conducted to assess follicular dynamics. Blood was collected to determine plasma concentrations of progesterone and estradiol. Females from G36h and GC had a greater (P < 0.05) estrous response than those from the G24h group (78.0 and 90.0 vs 0.0%, respectively). Ewes from G24h and G36h had earlier (P < 0.05) ovulation (48.0 ± 10.2 and 56.7 ± 5.7 h) compared with those from Gc (64.1 ± 9.7 h). The mean number of ovulations per ewe was greater (P < 0.05) in Gc (1.9 ± 0.6) and G36h (2.0 ± 1.0) than G24h (1.2 ± 0.4). Plasma concentrations of progesterone and estradiol differed ove...Continue Reading

References

Jul 20, 2007·Reproduction in Domestic Animals = Zuchthygiene·J ReynaW M C Maxwell
Jan 11, 2011·The Veterinary Clinics of North America. Food Animal Practice·José A AbeciaAntonio González-Bulnes
Sep 26, 2014·Tropical Animal Health and Production·Mario Felipe Alvarez BalaroFelipe Zandonadi Brandão

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Citations

Mar 27, 2018·Reproduction, Fertility, and Development·Gláucia M BragançaFelipe Z Brandão
Aug 7, 2020·Reproduction in Domestic Animals = Zuchthygiene·Vanessa M B Dos SantosFelipe Z Brandão
May 9, 2021·Cryobiology·José Carlos Ferreira-SilvaMarcos Antonio Lemos Oliveira

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