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Methods in molecular biology (Clifton, N.J.)2026; 3060; 351-378; doi: 10.1007/978-1-0716-5416-3_13

Oocyte and Embryo Vitrification in Horses.

Abstract: Vitrification has emerged as a decisive technique in assisted reproductive technology, offering superior cryopreservation outcomes for both oocytes and embryos compared with traditional slow freezing. This chapter provides a comprehensive overview of the vitrification of equine oocytes and embryos, emphasizing the influence of technical factors, including cryoprotectant selection, exposure time, temperature control, and device volume, on vitrification outcomes. Biological factors such as the oocyte maturation stage, the presence of cumulus cells, and embryo size are also explored, highlighting species-specific responses to cryodamage. Detailed protocols for oocyte and embryo vitrification and warming are presented, including media preparation, handling conditions, and critical timing steps. Additionally, storage logistics, labeling strategies, and cryo-room design to prevent sample mix-ups and ensure regulatory compliance are discussed.
© 2026. The Author(s), under exclusive license to Springer Science+Business Media, LLC, part of Springer Nature.
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Publication Date: 2026-09-13 PubMed ID: 42732503PubMed Central: 6558330DOI: 10.1007/978-1-0716-5416-3_13Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

Overview

  • This research article reviews the technique of vitrification for freezing horse oocytes and embryos.
  • It focuses on how technical and biological factors affect the success of this cryopreservation method and provides detailed protocols and practical considerations for its implementation.

Introduction to Vitrification in Equine Reproduction

  • Vitrification is a rapid freezing process that prevents ice crystal formation, which can damage cells during cryopreservation.
  • Compared to traditional slow freezing, vitrification offers improved outcomes for preserving horse oocytes (egg cells) and embryos.
  • This technique is critical in assisted reproductive technologies (ART) for horses, aiding in fertility preservation, breeding programs, and genetic resource banking.

Technical Factors Influencing Vitrification Success

  • Cryoprotectant Selection:
    • Type and concentration of cryoprotectants must balance toxicity and protective effects.
    • Commonly used cryoprotectants include ethylene glycol, dimethyl sulfoxide, and glycerol.
  • Exposure Time:
    • Duration of oocyte or embryo exposure to cryoprotectant solutions affects cell viability.
    • Too short may lead to inadequate protection, too long increases toxicity risk.
  • Temperature Control:
    • Precise temperature regulation during equilibration, vitrification, and warming phases is necessary to prevent damage.
    • Rapid cooling to avoid ice formation is essential.
  • Device Volume:
    • Using devices that hold very small volumes minimizes cooling time and facilitates rapid vitrification.
    • Devices such as open pulled straws and cryotops are common choices.

Biological Factors Affecting Vitrification Outcomes

  • Oocyte Maturation Stage:
    • The developmental stage at freezing (immature vs. mature oocytes) influences survival and developmental potential post-thaw.
  • Presence of Cumulus Cells:
    • Cumulus cells surrounding the oocyte provide protection and support during vitrification, impacting survival.
    • Removal or damage to these cells can reduce cryotolerance.
  • Embryo Size and Stage:
    • Smaller or early-stage embryos may vitrify differently from larger, more developed ones.
    • Species-specific reactions to cryodamage must be considered to optimize protocols.

Protocols for Vitrification and Warming

  • Media Preparation:
    • Preparation of vitrification and warming solutions with appropriate cryoprotectant concentrations and osmolarities.
  • Handling Conditions:
    • Maintaining aseptic techniques and controlled environments during manipulation.
    • Minimizing mechanical stress on cells during transfer and exposure.
  • Critical Timing Steps:
    • Careful timing during exposure to equilibration and vitrification solutions to balance cryoprotection and toxicity.
    • Rapid transfer to liquid nitrogen after vitrification.
  • Warming Process:
    • Stepwise dilution of cryoprotectants to avoid osmotic shock.
    • Rapid warming to prevent ice recrystallization.

Storage and Practical Considerations

  • Storage Logistics:
    • Proper labeling systems to identify samples unambiguously.
    • Organization in cryo-storage tanks to prevent mix-ups and maintain traceability.
  • Cryo-room Design:
    • Dedicated spaces with controlled environmental conditions for vitrification procedures.
    • Design considerations to minimize contamination risk and accommodate workflow.
  • Regulatory Compliance:
    • Adherence to guidelines for sample storage, record-keeping, and biosecurity.
    • Ensures ethical standards and traceability for breeding and research purposes.

Summary

  • The chapter consolidates current knowledge on equine oocyte and embryo vitrification, highlighting both theoretical and practical aspects.
  • Recognizes the importance of optimizing each step and factor to maximize cell survival and developmental potential post-thaw.
  • Provides a framework for researchers and practitioners to implement vitrification effectively in equine reproductive technologies.

Cite This Article

APA
Angel-Velez D, Serrano-Revuelta E, Van Soom A, Smits K. (2026). Oocyte and Embryo Vitrification in Horses. Methods Mol Biol, 3060, 351-378. https://doi.org/10.1007/978-1-0716-5416-3_13

Publication

Methods in molecular biology (Clifton, N.J.)
ISSN: 1940-6029
NlmUniqueID: 9214969
Country: United States
Language: English
Volume: 3060
Pages: 351-378

Researcher Affiliations

Angel-Velez, Daniel
  • Department of Internal Medicine, Reproduction and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
  • Research Group in Animal Sciences, Universidad CES, Medellín, Colombia.
Serrano-Revuelta, Elisa
  • Department of Internal Medicine, Reproduction and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Van Soom, Ann
  • Department of Internal Medicine, Reproduction and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
Smits, Katrien
  • Department of Internal Medicine, Reproduction and Population Medicine, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium. Katrien.Smits@UGent.be.

MeSH Terms

  • Animals
  • Horses
  • Vitrification
  • Cryopreservation / methods
  • Cryopreservation / veterinary
  • Oocytes / cytology
  • Cryoprotective Agents / pharmacology
  • Female
  • Embryo, Mammalian / cytology

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