Use of GnRH for Synchronization of the Follicular Wave in Assisted Reproductive Technologies in Sheep: A Preliminary Study

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Año-Perello, Aina and Santos Jiménez, Zurisaday and Encinas Cerezo, Teresa and Martínez-Ros, Paula and González Bulnes, Antonio (2020) Use of GnRH for Synchronization of the Follicular Wave in Assisted Reproductive Technologies in Sheep: A Preliminary Study. Animals, 10 (7). p. 1208. ISSN 2076-2615

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Official URL: https://doi.org/10.3390/ani10071208




Abstract

The present study aimed to set up a short-term protocol for synchronization of follicular wave emergence in sheep, concomitant with estrus synchronization, which would improve ovarian response in assisted reproductive technologies. Administration of a single GnRH dose, concomitant with the insertion of a progesterone-loaded CIDR device, caused regression of gonadotrophin-dependent follicles ≥4 mm in all the GnRH-treated sheep and in around 80% of the controls treated only with CIDR (p < 0.05). Similar percentages of ewes lost all follicles (around 70%) or only the largest one (around 30%) in both groups. Hence, 54.1% and 70% of the sheep lost all large follicles and initiated a new follicular wave in the control and GnRH groups, respectively (p < 0.05). The remaining sheep showed follicles that were still not dependent of luteinizing hormone (LH). So, in fact, all the sheep had non-dominant follicles after treatment. In conclusion, a treatment including GnRH at CIDR insertion would offer a time- and cost-efficient protocol for inducing follicular turnover and synchronizing a new follicular wave at any stage of the estrous cycle.


Item Type:Article
Uncontrolled Keywords:Assisted reproduction; estrus synchronization; follicle; GnRH; sheep
Subjects:Medical sciences > Veterinary > Sheep
Medical sciences > Veterinary > Veterinary obstetrics
ID Code:67514
Deposited On:26 Aug 2021 07:25
Last Modified:06 Sep 2021 09:20

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