Cryopreservation Techniques for Boar Semen Quality
Summary
Cryopreservation of boar semen underpins genetic management, artificial insemination programmes and global germplasm conservation. Successful freezing and thawing of porcine spermatozoa depend on a finely tuned sequence of dilution with specialised extenders, controlled cooling to subzero temperatures, incorporation of cryoprotectants and rapid warming. During freezing, formation of intracellular ice crystals and osmotic stress compromise membrane integrity, mitochondrial function and the acrosomal cap, leading to reduced motility, viability and fertilising capacity. Oxidative stress, driven by excessive reactive oxygen species (ROS), further impairs sperm structure and DNA integrity. Recent advances have focused on refining extender composition with antioxidants, natural polysaccharides and tailored cryoprotectant mixtures to mitigate cryoinjury. Concurrently, the identification of molecular markers for cryotolerance has enabled pre-freezing assessment of ejaculate quality, paving the way for custom-designed protocols that optimise cooling rates, thawing regimes and supplementation. Insights into cryo-capacitation reveal that signalling pathways, including kinase-mediated phosphorylation events, are modulated during cryopreservation, with downstream effects on motility and fertilisation potential. Together, these developments promise more consistent post-thaw performance, enhanced genetic resource utilisation and improved reproductive outcomes in swine production worldwide.
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Cryopreservation Techniques for Boar Semen Quality publication trend
The graph below shows the total number of articles in cryopreservation techniques for boar semen quality across all publications each year (not limited to Nature Index journals).
Technical terms
Cryopreservation: The process of preserving cells or tissues at very low temperatures to halt biological activity and maintain viability.
Cryoprotectant: A substance, such as glycerol or dimethyl sulfoxide, added to extenders to prevent ice crystal formation and osmotic damage during freezing.
Reactive oxygen species (ROS): Chemically reactive molecules containing oxygen that can damage cellular components, including lipids, proteins and DNA.
Semen extender: A specialised solution used to dilute and protect spermatozoa during storage and cryopreservation.
Cryo-capacitation: A capacitation-like change induced in spermatozoa by the cryopreservation process, affecting membrane fluidity and fertilisation readiness.
Mitochondrial membrane potential: The electrochemical gradient across the mitochondrial membrane, essential for ATP production and sperm motility.
References
- Effect of Poria cocos Mushroom Polysaccharides (PCPs) on the Quality and DNA Methylation of Cryopreserved Shanghai White Pig Spermatozoa. Cells (2023).
- Molecular Markers: A New Paradigm in the Prediction of Sperm Freezability. International Journal of Molecular Sciences (2023).
- piR-121380 Is Involved in Cryo-Capacitation and Regulates Post-Thawed Boar Sperm Quality Through Phosphorylation of ERK2 via Targeting PTPN7. Frontiers in Cell and Developmental Biology (2022).
- Freeze-thawing impairs the motility, plasma membrane integrity and mitochondria function of boar spermatozoa through generating excessive ROS. BMC Veterinary Research (2021).
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