Assessment of Boar Semen Morphology and Morphometry

The evaluation of sperm morphology is crucial in assessing reproductive health in both humans and animals. In humans, the World Health Organization recognizes the importance of morphology in semen analysis. Similarly, in animal breeding programs, assessing sperm morphology is essential for selecting superior breeding candidates. This review specifically focuses on the pig as a model, given its importance in meat production and as a research model for reproductive biology. Several studies have demonstrated the impact of sperm morphological abnormalities on fertility in pigs, although some studies have reported conflicting results. Understanding the importance of semen morphology evaluation in boar production and describing the changes in semen morphology and evaluation procedures are the main objectives of this review. Factors influencing semen morphological abnormalities, such as breed, age, and environmental conditions, are discussed. Various techniques for assessing sperm morphology, including traditional microscopic evaluation, staining techniques, computer-assisted sperm analysis (CASA), and advanced imaging techniques, are reviewed. The relationships between morphology and other sperm parameters are explored, and the significance of morphology in the production of seminal doses is emphasized. Finally, future directions and challenges in the assessment of boar sperm morphology are discussed, including advances in imaging and analysis techniques, integration of molecular and genetic approaches, standardization of guidelines, and research into fertility outcomes and long-term follow-up studies. By addressing these challenges, improvements in the diagnosis and reproductive outcomes of individuals with abnormal sperm morphology can be achieved.