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Article

Vitrification of Donkey Sperm: Is It Better Using Permeable Cryoprotectants?

Veterinary Reproduction Group, Department of Medicine and Animal Surgery, Faculty of Veterinary Medicine, University of Cordoba, 14071 Cordoba, Spain
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Author to whom correspondence should be addressed.
Animals 2020, 10(9), 1462; https://doi.org/10.3390/ani10091462
Received: 30 July 2020 / Revised: 13 August 2020 / Accepted: 17 August 2020 / Published: 20 August 2020
(This article belongs to the Special Issue Advances in Donkey and Mule Research)
Conventional donkey sperm-freezing using permeable cryoprotectants has been successfully performed, and good sperm parameters have been obtained after thawing. Unfortunately, artificial insemination of jennies with cryopreserved semen has given unsatisfactory results. Vitrification by directly dropping the sperm into the liquid nitrogen following the spheres methodology has been developed in human beings as an alternative to conventional freezing. This technique has shown to be a species-specific methodology and the concentration of cryoprotectants should be optimized in donkeys. Additionally, in this study, a permeable cryoprotectant (glycerol) has been tested for the first time for donkey sperm vitrification. According to our findings, vitrification of donkey sperm was effectively carried out using an extender supplemented with sucrose or bovine serum albumin (BSA) as non-permeable agent. When glycerol, a permeable agent, was compared to sucrose 0.1 M and BSA 5%, sperm quality significantly decreased. Therefore, donkey sperm vitrification in the absence of permeable agents obtained better results and gives a new approach to create a pattern for future studies of fertility trials.
Vitrification by direct exposure of sperm to liquid nitrogen is increasing in popularity as an alternative to conventional freezing. In this study, the effect of permeable cryoprotectant agents for donkey sperm vitrification was compared to an extender containing non-permeable cryoprotectants. First, three different concentrations of sucrose (0.1, 0.2, and 0.3 molar, M) and bovine serum albumin, BSA (1, 5, and 10%) were compared. Secondly, the concentration of non-permeable agents producing the most desirable results was compared to an extender containing glycerol as permeable agent. Vitrification was performed by dropping 30 μL of sperm suspension directly into LN2 and warming at 42 °C. Sperm motility (total, TM; and progressive, PM) and plasma membrane integrity, PMI (mean ± SEM) were statistically compared between treatments. Sucrose 0.1 M showed a significantly higher percentage of total sperm motility (21.67 ± 9.22%) than sucrose 0.2 M (14.16 ± 4.50%) and 0.3 M (8.58 ± 6.22%); and no differences were found in comparison to the control (19.71 ± 10.16%). Vitrification with sucrose 0.1 M or BSA 5% obtained similar results for TM (21.67 ± 9.22% vs. 19.93 ± 9.93%), PM (13.42 ± 6.85% vs. 12.54 ± 6.37%) and PMI (40.90 ± 13.51% vs. 37.09 ± 14.28); but both showed higher percentages than glycerol (TM = 9.71 ± 4.19%; PM = 5.47 ± 3.17%; PMI = 28.48 ± 15.55%). In conclusion, donkey sperm vitrification in spheres using non-permeable cryoprotectants exhibited better sperm motility and viability parameters after warming than sperm vitrification using extenders containing permeable cryoprotectants. View Full-Text
Keywords: donkey; sperm; vitrification; spheres; sucrose; BSA; glycerol donkey; sperm; vitrification; spheres; sucrose; BSA; glycerol
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MDPI and ACS Style

Hidalgo, M.; Diaz-Jimenez, M.; Consuegra, C.; Pereira, B.; Dorado, J. Vitrification of Donkey Sperm: Is It Better Using Permeable Cryoprotectants? Animals 2020, 10, 1462. https://doi.org/10.3390/ani10091462

AMA Style

Hidalgo M, Diaz-Jimenez M, Consuegra C, Pereira B, Dorado J. Vitrification of Donkey Sperm: Is It Better Using Permeable Cryoprotectants? Animals. 2020; 10(9):1462. https://doi.org/10.3390/ani10091462

Chicago/Turabian Style

Hidalgo, Manuel, Maria Diaz-Jimenez, César Consuegra, Blasa Pereira, and Jesús Dorado. 2020. "Vitrification of Donkey Sperm: Is It Better Using Permeable Cryoprotectants?" Animals 10, no. 9: 1462. https://doi.org/10.3390/ani10091462

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