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Bottrel M, Hidalgo M, Mogas T, Pereira B, Ortiz I, Díaz-Jiménez M, Consuegra C, Morató R, Dorado J. One-step warming does not affect the in vitro viability and cryosurvival of cryotop-vitrified donkey embryos. Theriogenology 2020; 152:47-52. [PMID: 32361488 DOI: 10.1016/j.theriogenology.2020.04.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/11/2020] [Accepted: 04/18/2020] [Indexed: 11/15/2022]
Abstract
The objective of this study was to compare the effects of two warming protocols (three-step vs. one-step dilution) on embryo quality, post-warming embryo survival and embryo cell viability of donkey embryos vitrified by the Cryotop method. Twenty, Day 7-8, grade 1-2 donkey embryos were measured, morphologically evaluated and vitrified using the Cryotop technique. Embryos were then randomly warmed using two different warming procedures: (i) W3 (three-step dilution; n = 11): embryos were warmed in 1 M, 0.5 M and 0 M sucrose, and (ii) W1/0.5 (one-step dilution; n = 9): embryos were warmed directly in 0.5 M sucrose. After 3 and 24 h of warming, the embryos were measured and evaluated for their morphology, developmental stage and viability (Propidium Iodide-Hoechst 33,342 dyes). Although both treatments decreased embryo quality after warming (P < 0.05), no significant differences (P > 0.05) were observed between protocols in terms of post-warming embryo quality, diameter and embryo survival. Greater percentages of dead cells (P < 0.001) were observed when embryos were warmed directly in 0.5 M sucrose (one-step dilution) when compared to the three-step protocol. The percentage of ruptured embryos was 27.3% and 0% in W3 and W1/0.5 protocols (P = 0.0893), respectively. In conclusion, warming Cryotop-vitrified donkey embryos directly in 0.5 M sucrose had no negative effects on embryo quality and post-warming embryo survival. Moreover, one-step protocol may help to prevent rupture when donkey embryos warmed directly in 0.5 M sucrose. These results observed in vitro must be verified by embryo transfer.
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Affiliation(s)
- M Bottrel
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - M Hidalgo
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - T Mogas
- Department of Animal Medicine and Surgery, Autonomous University of Barcelona, 08193, Cerdanyola Del Vallès, Spain
| | - B Pereira
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - I Ortiz
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - M Díaz-Jiménez
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - C Consuegra
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain
| | - R Morató
- Department of Animal Medicine and Surgery, Autonomous University of Barcelona, 08193, Cerdanyola Del Vallès, Spain
| | - J Dorado
- Veterinary Reproduction Group, Department of Animal Medicine and Surgery. Faculty of Veterinary Medicine, University of Cordoba, 14071, Cordoba, Spain.
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