Vitrification of Equine In Vivo-Derived Embryos After Blastocoel Aspiration.

The research article focuses on improving the success rate of equine embryo cryopreservation by combining this process with the technique of collapsing the blastocoel cavity. Practical application of this method has resulted in higher pregnancy rates among horses.

Introduction

• The study begins with an observation that while embryo cryopreservation is a common and successful method in species like humans and cattle, it poses difficulties when applied to in vivo-derived equine embryos.
• These difficulties stem from the large size of equine embryos and the presence of an impermeable capsule, which resists the infiltration of cryoprotectants – substances used to protect biological tissue from freezing damage.

Blastocoel Cavity Collapse

• The researchers introduced a solution to this problem by implementing a micromanipulation system to collapse the blastocoel cavity of the embryos.
• The blastocoel cavity is a fluid-filled space within the embryo that significantly contributes to its size.
• Collapsing this cavity reduces the size of the embryo and helps in the successful penetration of cryoprotectants.

Vitrification Process

• Once the blastocoel cavity is collapsed, the embryo is subjected to the vitrification process.
• Vitrification, which is essentially ultra-rapid freezing, solidifies the embryos into a glass-like state and prevents the formation of ice crystals that can potentially damage the embryo.
• The vitrified embryos can then be stored indefinitely and later thawed for use in equine reproduction.

Results

• The researchers reported achieving high pregnancy rates when combining the process of vitrification with the technique of embryo collapse.
• This represents a significant breakthrough in the field of equine reproduction, potentially increasing the success of horse breeding and embryo preservation.