Relationship between stallion sperm motility and viability as detected by two fluorescence staining techniques using flow cytometry.

This research investigates the relationship between the motility and viability of stallion sperm samples. It involved the use of two fluorescence staining techniques on fresh semen that had different amounts of dead sperm added to it. The results from both staining methods were consistent, and time and treatment factors significantly affected both sperm motility and viability.

Research Methodology

• The study involved the evaluation of links between sperm motion characteristics and viability. It used two distinct fluorescent staining methods on fresh extended equine sperm.
• These semen samples had various amounts of dead spermatozoa added. This technique allowed for the simulation of different levels of viable and nonviable (dead) sperm.
• Both staining procedures incorporated the use of two types of dyes, SYBR-14 and propidium iodide (PI). A mitochondrial probe called JC-1 was added in the second staining technique.

Findings

• The correlation between the total sperm motility and percentage of viable sperm was high (r=0.98), signifying a strong association between these factors irrespective of the staining protocols implemented.
• The study found that the time (0 hours versus 24 hours) and treatment (0, 10, 25, 50, and 75% nonviable sperm) affected the overall sperm motility and viability significantly (P<0.0001) for both staining protocols. This implies that changes in these variables resulted in measurable differences in total motility and sperm viability percentages.
• The actual percentage of viable sperm for each time period and treatment did not differ from the expected values, indicating that the sample processing methods used provided reliable and consistent results.

Conclusion

• Overall, this research provides insights into the correlation between motility and viability of stallion sperm. This correlation could potentially be key to assessing the fertility of stallions, aiding in the understanding and improvement of reproduction processes.
• The results also highlight the effectiveness of the selected dyes and staining techniques in accurately discerning between viable and non-viable sperm cells.