Computer-assisted sperm head morphometry analysis (ASMA) of cryopreserved ram spermatozoa

Area of Science:

• Reproductive Biology
• Animal Science
• Veterinary Medicine

Background:

• Subjective sperm morphology assessment is highly variable and impacts male fertility evaluation.
• Computer-assisted sperm morphometry analysis (ASMA) offers objective measurement of sperm head dimensions.
• Standardized protocols are needed to enhance the efficiency and applicability of ASMA systems.

Purpose of the Study:

• To develop accurate and efficient protocols for computer-assisted sperm morphometry analysis (ASMA) of ram sperm heads.
• To optimize staining methods, sample size, magnification, and assess technician variability for ASMA.

Main Methods:

• Frozen semen from 10 fertile rams was thawed and prepared for morphometric analysis.
• Hematoxylin and rose bengal stains were evaluated for optimal staining.
• Sperm head morphometry was analyzed at x40 magnification, assessing at least 100 spermatozoa per sample.

Main Results:

• Hematoxylin and rose bengal staining provided optimal results for ram sperm head morphometry.
• Accurate analysis was achieved with at least 100 spermatozoa at x40 magnification, with sample analysis in ~3 minutes.
• No significant differences in measurements were found between two technicians, with high system recognition (95%) and low variation (≤2.4%).

Conclusions:

• Optimized ASMA protocols using specific stains and parameters enable accurate and efficient objective analysis of ram sperm head morphometry.
• The developed methods minimize technician variability, ensuring reliable data for male fertility assessment in rams.
• Standardized ASMA procedures enhance the utility of objective sperm analysis in animal reproduction.