Post-rewarming Developmental Competence of in vitro Produced Buffalo (Bubalis Bubalis) Embryos Vitrified Using the...

Area of Science:

• Reproductive biology
• Embryology
• Cryopreservation

Background:

• Vitrification is an ultra-rapid freezing method for germplasm preservation.
• It is used under high salt concentrations with minimal exposure time.

Purpose of the Study:

• To evaluate the developmental potential of in vitro-produced buffalo embryos after vitrification using the solid surface technique.
• To compare different cryoprotectant concentrations for embryo vitrification.

Main Methods:

• Buffalo oocytes were matured and fertilized in vitro.
• Morula-stage embryos were vitrified using two protocols: Protocol-1 (35% ethylene glycol) and Protocol-2 (15% ethylene glycol and 15% dimethyl sulfoxide).
• Vitrified-thawed embryos were cultured to the blastocyst stage.

Main Results:

• Protocol-1 resulted in significantly higher compact morula formation post-thaw compared to Protocol-2.
• Blastocyst development rates did not differ significantly between the two vitrification protocols.
• Non-vitrified control embryos showed significantly higher developmental rates than vitrified embryos.

Conclusions:

• Cryopreservation significantly reduced the developmental potential of pre-implantation buffalo embryos compared to fresh embryos.
• Optimization of cryoprotectant type and concentration is crucial for improving viable embryonic development after vitrification.