Equine Semen Preservation and Fertility Optimization
Summary
Equine semen preservation encompasses a suite of techniques designed to extend sperm viability from collection through to artificial insemination. Central to this endeavour is cryopreservation, in which spermatozoa are cooled to subzero temperatures in the presence of protective agents known as extenders. These extenders supply energy substrates, membrane stabilisers and cryoprotectants such as glycerol to mitigate ice-crystal formation and osmotic stress. Seminal plasma components, including proteins and antioxidants, influence post-thaw motility, membrane integrity and DNA stability, and may be selectively retained or supplemented to enhance freezability. Concurrently, developments in cooled-semen transport protocols exploit controlled refrigeration to preserve fertility potential without full freezing, balancing logistical convenience with sperm longevity. Fertility optimisation further relies on precise evaluation of sperm function through objective measures of motility, viability and subpopulation analysis, combined with predictive modelling of pregnancy outcomes. Together, these advances underpin global breeding programmes by improving conception rates, reducing biosecurity risks and enabling genetic exchange across geographic boundaries.
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Equine Semen Preservation and Fertility Optimization publication trend
The graph below shows the total number of articles in equine semen preservation and fertility optimization across all publications each year (not limited to Nature Index journals).
Technical terms
Cryopreservation: The process of cooling and storing spermatozoa at subzero temperatures to preserve viability over extended periods.
Extender: A formulation containing nutrients, buffering agents and cryoprotectants used to dilute and protect sperm during cooling or freezing.
Seminal plasma: The fluid component of ejaculate that surrounds spermatozoa, rich in proteins, electrolytes and antioxidants affecting sperm function.
Reactive oxygen species (ROS): Chemically reactive molecules containing oxygen that can damage lipids, proteins and DNA in sperm cells.
Computer-assisted sperm analysis (CASA): An automated technique for quantifying sperm motility and kinematic parameters such as velocity and trajectory.
References
- Impact of Seminal Plasma Antioxidants on DNA Fragmentation and Lipid Peroxidation of Frozen–Thawed Horse Sperm. Antioxidants (2024).
- Predicting the Outcome of Equine Artificial Inseminations Using Chilled Semen. Animals (2023).
- The efficiency of different types of extenders for semen cooling in stallions. Animal Bioscience (2022).
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