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Veterinary sciences2024; 11(2); doi: 10.3390/vetsci11020065

Freezing Stallion Semen-What Do We Need to Focus on for the Future?

Abstract: Artificial insemination (AI) is used frequently in the breeding of sport horses, apart from Thoroughbreds. Most AIs are carried out with cooled semen rather than frozen semen because of the difficulties in identifying a protocol that is suitable for freezing most ejaculates and the necessity to inseminate close to ovulation because of the short life of the thawed spermatozoa. More widespread use of frozen semen would improve biosecurity, allow greater choice of stallions, and offer more flexibility when managing deliveries of semen to the stud. It would even decrease the amount of antibiotics used in semen extenders, since the volume of frozen semen is smaller than when cooled semen is inseminated. However, there is considerable variability in the cryosurvival of spermatozoa from different stallions, leading to the classification of stallions as good or bad freezers. Improvements could be made at the level of stallion nutrition, the semen collection regimen, the extender, the removal of seminal plasma, and the cooling protocol, among others. Stallion sperm membranes are highly susceptible to lipid peroxidation, but research on antioxidants has failed to identify an additive that would benefit all stallions. In the future, biomarkers for sperm freezability could be used as an aid in identifying suitable ejaculates for cryopreservation.
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Publication Date: 2024-02-02 PubMed ID: 38393083PubMed Central: PMC10893461DOI: 10.3390/vetsci11020065Google 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.

The research article discusses the challenges and potential improvements related to freezing horse semen for artificial insemination (AI) procedures. It proposes advancements in areas such as stallion nutrition, semen collection, and the identification of biomarkers for better sperm freezability.

Artificial Insemination and the Use of Frozen Semen

  • The article begins by highlighting the frequent use of artificial insemination (AI) in sport horses breeding, not including Thoroughbreds. However, most AI procedures use cooled semen over frozen semen.
  • This preference is mainly due to challenges in developing a universally-effective freezing protocol for all ejaculates, and the short life of thawed spermatozoa, necessitating insemination close to ovulation.

Advantages of Using Frozen Semen

  • Increased use of frozen semen could potentially improve biosecurity and offer greater flexibility in semen deliveries to the stud. It would also allow for more stallion choices.
  • Because of the smaller volume required for AI compared to cooled semen, the use of frozen semen could also potentially reduce the amount of antibiotics used in semen extenders.

Challenges with the Use of Frozen Semen

  • The article acknowledges that there are considerable variations in the cryosurvival – the ability of living organisms to withstand freezing conditions – of spermatozoa from different stallions. This results in stallions being classified as either good or bad freezers.
  • Stallion sperm membranes are considerably prone to lipid peroxidation, a process which can damage cell structures.

Potential Improvements in the Process

  • Improvements in freezing stallion semen could be achieved through various means, including optimizing stallion nutrition, refining the semen collection regimen, improving the extender used, increasing the removal of seminal plasma, and bettering the cooling protocol.
  • Research into antioxidants has yet to determine an additive that would benefit all stallions universally, suggesting the need for individualized approaches or further research in this area.
  • In future, identifying biomarkers for sperm freezability could help in choosing which ejaculates are best suited for cryopreservation, an area that currently faces challenges due to significant variability between different stallions.

Cite This Article

APA
Al-Kass Z, Morrell JM. (2024). Freezing Stallion Semen-What Do We Need to Focus on for the Future? Vet Sci, 11(2). https://doi.org/10.3390/vetsci11020065

Publication

Veterinary sciences
ISSN: 2306-7381
NlmUniqueID: 101680127
Country: Switzerland
Language: English
Volume: 11
Issue: 2

Researcher Affiliations

Al-Kass, Ziyad
  • Clinical Sciences, Swedish University of Agricultural Sciences, Box 7054, SE-75007 Uppsala, Sweden.
  • Department of Surgery and Theriogenology, College of Veterinary Medicine, University of Mosul, Mosul 41002, Iraq.
Morrell, Jane M
  • Clinical Sciences, Swedish University of Agricultural Sciences, Box 7054, SE-75007 Uppsala, Sweden.

Conflict of Interest Statement

The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

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Citations

This article has been cited 4 times.
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