New Approaches to Boar Semen Evaluation, Processing and Improvement

Area of Science:

• Animal Science
• Reproductive Biology
• Biotechnology

Background:

• Boar reproductive performance is crucial for swine herd management in the United States.
• Advancements in andrology and a deeper understanding of sperm function are key to improving fertility.
• Current methods for evaluating semen and predicting fertility in boars have limitations.

Purpose of the Study:

• To explore advanced technologies for objective single ejaculate evaluation and individual boar fertility prediction.
• To identify novel biomarkers and analytical methods for assessing sperm quality and function.
• To investigate strategies for managing reactive oxygen species (ROS) and enhancing sperm viability.

Main Methods:

• Automated flow cytometric semen analysis using vital stains for acrosomal integrity and mitochondrial potential.
• DNA fragmentation analysis and quantification of specific biomarkers (ubiquitin, PAWP, ALOX15, aggresome).
• Measurement of sperm-produced reactive oxygen species (ROS) and application of ROS-scavenging antioxidants.
• Utilizing alternative energy substrates and stimulants like inorganic pyrophosphate and caffeine.
• Image-based flow cytometry for sperm phenotype analysis integrated with swine genomics.
• Semen purification techniques including nanoparticle-based purification and magnetic-activated sperm sorting.

Main Results:

• Automated flow cytometry with vital stains and specific biomarkers can objectively assess sperm phenotypes.
• Measurement of ROS levels provides an indicator of semen quality, manageable with antioxidants.
• Energy substrates and stimulants can extend sperm lifespan in extended semen and within the female reproductive tract.
• Sperm phenotype analysis can be linked to fertility-influencing gene polymorphisms through advancements in swine genomics.
• Semen purification methods show potential for rescuing poor-quality ejaculates and improving acceptable ones.

Conclusions:

• Advanced andrology techniques, including flow cytometry and biomarker analysis, offer new possibilities for boar fertility prediction and reproductive management.
• Strategies for managing ROS, enhancing sperm viability, and purifying semen can significantly improve reproductive outcomes in swine.
• Integration of these technologies with swine genomics holds promise for a comprehensive understanding of fertility.
• Successful adoption hinges on addressing challenges related to technology implementation, dissemination, and cost reduction in the swine industry.