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Minimum Volume Vitrification of Immature Feline Oocytes
Published on: June 24, 2020
Immature cat oocyte vitrification in open pulled straws (OPSs) using a cryoprotectant mixture
1Department of Veterinary Clinic Sciences, University of Naples Federico II, Naples, Italy. ncocchia@unina.it
Cryobiology
|January 19, 2010
Summary
Vitrification successfully cryopreserved immature domestic cat oocytes, enabling development to the blastocyst stage. This method offers a promising tool for felid species conservation through assisted reproduction.
Area of Science:
- Veterinary Medicine
- Reproductive Biology
- Cryobiology
Background:
- Cryopreservation of gametes is crucial for assisted reproduction in felid species.
- Optimizing cryopreservation techniques is essential for successful captive breeding programs.
Purpose of the Study:
- To evaluate vitrification for cryopreserving immature domestic cat oocytes.
- To assess the survival and developmental competence of vitrified oocytes after in vitro maturation and fertilization.
Main Methods:
- Vitrification of cumulus-oocyte complexes (COC) using dimethyl sulfoxide (DMSO) and ethylene glycol (EG) in sucrose medium.
- Viability assessment using double staining (carboxyfluorescein and Trypan blue).
- Evaluation of developmental competence through in vitro maturation (IVM), in vitro fertilization (IVF), and in vitro culture (IVC).
Main Results:
- Vitrification resulted in a significantly higher percentage of non-viable COC compared to controls (11% vs 54.5%).
- Cleavage rates were significantly lower in vitrified oocytes (18.6%) than in control oocytes (48.2%).
- Blastocyst rates on day 8 were higher for control oocytes (20.6%) than for vitrified oocytes (4.3%).
Conclusions:
- The developed vitrification protocol supports the development of immature domestic cat oocytes to the blastocyst stage.
- This study reports for the first time the development of vitrified germinal vesicle (GV) oocytes in domestic cats.
