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Accessory sperm numbers for cattle inseminated with protamine sulfate microcapsules
T W Munkittrick1, R L Nebel, R G Saacke
1Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315.
Journal of Dairy Science
|March 1, 1992
Summary
Microencapsulation of cattle sperm did not increase accessory sperm numbers. However, it did reduce the number of accessory sperm for the specific encapsulated type, showing potential for sperm selection in artificial insemination.
Area of Science:
- Reproductive Biology
- Animal Science
- Biotechnology
Background:
- Accessory sperm numbers in cattle embryos can influence embryo quality.
- Microencapsulation is a technique explored for sperm manipulation in assisted reproductive technologies.
Purpose of the Study:
- To evaluate the impact of microencapsulation on accessory sperm numbers in cattle using morphologically distinct sperm populations.
- To determine if protamine sulfate microcapsules affect sperm release and subsequent attachment to the zona pellucida in vivo.
Main Methods:
- A heterospermic trial was conducted with morphologically normal and tapered sperm populations.
- Sperm were either encapsulated in protamine sulfate microcapsules or left unencapsulated in reciprocal inseminates.
- Embryos were recovered 6 days post-insemination, and accessory sperm within the zona pellucida were counted and classified.
Main Results:
- Microencapsulated sperm contributed 25.7% of accessory sperm in inseminates containing microcapsules.
- Microencapsulation did not alter the total accessory sperm count per embryo but reduced counts for the specific encapsulated sperm type.
- Embryo quality was significantly related to accessory sperm numbers (P < .01).
Conclusions:
- Sperm encapsulated in protamine sulfate microcapsules can be released and attach to the zona pellucida in vivo.
- Microencapsulation did not enhance overall accessory sperm numbers in this experimental setup.
- Further research may explore optimal timing for microencapsulation-assisted insemination.