Large-scale isolation of equine zonae pellucidae

Area of Science:

• Veterinary Science
• Reproductive Biology
• Gamete Biology

Background:

• Equine oocyte isolation is crucial for reproductive research and assisted reproductive technologies.
• Existing methods for equine oocyte recovery can be time-consuming and may result in lower yields or compromised oocyte integrity.

Purpose of the Study:

• To develop a simple, rapid, and cost-effective method for large-scale isolation of cumulus cell-free, zona pellucida-intact equine oocytes.
• To provide a reliable technique for obtaining high-quality equine oocytes suitable for biochemical and functional assays.

Main Methods:

• Aspiration of equine oocytes from frozen-thawed ovaries using a constant vacuum source.
• Filtration of follicular aspirates through a series of nylon screens with alternating mesh sizes.
• Use of sodium citrate buffer and a stereomicroscope for oocyte identification and collection.

Main Results:

• Successful isolation of cumulus cell-free, zona pellucida-intact equine oocytes on a large scale.
• The described method is inexpensive and time-efficient.
• Recovery rates are comparable to or better than previously reported methods.

Conclusions:

• The developed method offers an efficient and economical approach for equine oocyte recovery.
• The isolated oocytes are suitable for biochemical evaluation of the equine zona pellucida (EZP) and sperm-egg binding assays.
• This technique can facilitate advancements in equine reproductive research and applications.