Semen Preservation Techniques in Felid Species

The conservation of wild felid populations increasingly relies on assisted reproductive technologies, among which semen preservation plays a central role. Effective preservation demands an integrated approach encompassing semen collection, evaluation, dilution in specialised extenders, controlled cooling, cryoprotectant selection and post-thaw quality assessment. Semen may be obtained by electro-ejaculation, pharmacological urethral catheterisation or epididymal retrieval, each method tailored to species-specific anatomy and welfare considerations. Following collection, semen is diluted in extenders composed of buffering agents, energy substrates and cryoprotectants such as glycerol or dimethyl sulfoxide. Cooling rates are then precisely regulated to avoid intracellular ice formation, employing programmable freezers, liquid nitrogen vapour or field-adapted methods. Vitrification has been explored as an alternative to conventional slow freezing, achieving glass-like solidification without ice crystals but requiring higher cryoprotectant concentrations. Post-thaw analyses assess motility, viability, membrane integrity and acrosomal status, guiding protocol refinement. Advances in extender composition, toxicity profiling of cryoprotectants and portable cooling systems are expanding the toolbox for gene banking, in vitro fertilisation and intrauterine insemination of endangered felids globally.

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Semen Preservation Techniques in Felid Species publication trend

The graph below shows the total number of articles in semen preservation techniques in felid species across all publications each year (not limited to Nature Index journals).

Technical terms

Cryopreservation: Preservation of cells or tissues at ultra-low temperatures to arrest metabolic activity and prolong viability.

Cryoprotectant: Chemical additive (e.g. glycerol, dimethyl sulfoxide) that reduces ice crystal formation and cellular damage during freezing and thawing.

Extender: A buffered solution containing nutrients, stabilisers and cryoprotectants used to dilute and protect sperm during cooling and storage.

Vitrification: Rapid freezing method that solidifies samples into a glass-like state without ice crystallisation, requiring high cryoprotectant concentrations.

Acrosome Integrity: Status of the sperm’s apical vesicle, essential for successful penetration of the oocyte’s zona pellucida during fertilisation.

References

1. Comprehensive overview of the toxicities of small-molecule cryoprotectants for carnivorous spermatozoa: foundation for computational cryobiotechnology. Frontiers in Toxicology (2025).
2. First Evaluations and Cryopreservation of Semen Samples from Sunda Clouded Leopards (Neofelis diardi). Animals (2020).
3. Field friendly method for wild feline semen cryopreservation. Journal of Threatened Taxa (2020).
4. Comparison between two glycerol concentrations to cryopreservation of semen of mountain lions (Puma concolor). Pesquisa Veterinária Brasileira (2013).
5. Colheita farmacológica de sêmen de onças-pardas (Puma concolor: Mammalia: Carnivora: Felidae). Arquivo Brasileiro de Medicina Veterinária e Zootecnia (2020).
6. Canine and Feline Epididymal Semen—A Plentiful Source of Gametes. Animals (2021).