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Article

Use of Propylene-Glycol as a Cosolvent for GnRH in Synchronization of Estrus and Ovulation in Sheep

1
Departamento de Farmacologia y Toxicologia Facultad de Veterinaria, UCM, Ciudad Universitaria s/n, 28040 Madrid, Spain
2
Universidad Autónoma Agraria Antonio Narro, Torreón, Coahuila 25315, Mexico
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Departamento de Produccion y Sanidad Animal, Facultad de Veterinaria, Universidad Cardenal Herrera-CEU, CEU Universities, C/ Tirant lo Blanc, 7, Alfara del Patriarca, 46115 Valencia, Spain
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Dipartamento di Medicina Veterinaria, Università degli Studi di Sassari, Via Vienna 2, 07100 Sassari, Italy
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Departamento de Reproduccion Animal, INIA, Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Animals 2020, 10(5), 897; https://doi.org/10.3390/ani10050897
Received: 29 April 2020 / Revised: 18 May 2020 / Accepted: 19 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Reproductive Management of Sheep and Goats)
The foreseeable shortage of equine chorionic gonadotrophin (eCG) for estrus synchronization in sheep will have a huge impact on breeders using out-of-season breeding, artificial insemination, or embryo transfer because there is no other product with similar activity. Hence, there is a strong need for alternative protocols. The aim of the present work was to evaluate the reproductive response of sheep in breeding season to the administration of gonadotrophin-releasing hormone (GnRH) using propylene-glycol as a cosolvent, as well as the most adequate timing for such administration. From the results obtained, protocols based on a short-term treatment with a Controlled Internal Drug Release (CIDR) device and a single dose of GnRH in propylene-glycol at 36 h after CIDR removal may constitute an alternative to traditional protocols based on the administration of a single dose of eCG at CIDR removal.
The foreseen shortage of eCG for estrus synchronization in sheep makes necessary the development of alternative protocols. The aim of the present work was to evaluate the reproductive response of sheep in breeding season to the administration of GnRH using propylene-glycol as a cosolvent and the subcutaneous route for slowing and extending the release of GnRH, as well as the most adequate timing for such administration. In the present study, protocols based on a short-term CIDR treatment and a single subcutaneous dose of GnRH in propylene-glycol at 36 h after CIDR removal induced a similar ovarian response to protocols based on administration of eCG at CIDR removal or intramuscular GnRH in distilled water at 56 h after. In such protocol, 80% of the animals developed estrus in a narrow timing (75% between 36 and 48 h after CIDR removal), and all of them also ovulated in a narrow window (87.5% between 72 and 76 h after CIDR removal, with 62.5% between 72 and 76 h) and showed a similar ovulation rate and plasma progesterone concentrations at the induced estrous cycle. Hence, administration of GnRH in propylene-glycol may constitute an alternative to traditional protocols based on the administration of eCG. View Full-Text
Keywords: eCG; estrus synchronization; GnRH; propylene-glycol; sheep eCG; estrus synchronization; GnRH; propylene-glycol; sheep
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MDPI and ACS Style

Santos-Jimenez, Z.; Guillen-Gargallo, S.; Encinas, T.; Berlinguer, F.; Veliz-Deras, F.G.; Martinez-Ros, P.; Gonzalez-Bulnes, A. Use of Propylene-Glycol as a Cosolvent for GnRH in Synchronization of Estrus and Ovulation in Sheep. Animals 2020, 10, 897. https://doi.org/10.3390/ani10050897

AMA Style

Santos-Jimenez Z, Guillen-Gargallo S, Encinas T, Berlinguer F, Veliz-Deras FG, Martinez-Ros P, Gonzalez-Bulnes A. Use of Propylene-Glycol as a Cosolvent for GnRH in Synchronization of Estrus and Ovulation in Sheep. Animals. 2020; 10(5):897. https://doi.org/10.3390/ani10050897

Chicago/Turabian Style

Santos-Jimenez, Zurisaday, Sara Guillen-Gargallo, Teresa Encinas, Fiammetta Berlinguer, Francisco G. Veliz-Deras, Paula Martinez-Ros, and Antonio Gonzalez-Bulnes. 2020. "Use of Propylene-Glycol as a Cosolvent for GnRH in Synchronization of Estrus and Ovulation in Sheep" Animals 10, no. 5: 897. https://doi.org/10.3390/ani10050897

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