Supportive techniques to investigate in vitro culture and cryopreservation efficiencies of equine ovarian tissue: A review.

This research article presents a review of the latest advancements in techniques used to analyze and manipulate equine ovarian tissue and preantral follicles in laboratory conditions, as well as during in vitro culture and cryopreservation procedures. The study seeks to optimize the use of ovarian tissue in assisted reproductive technologies and contribute to safeguarding the reproductive potential of high-value domestic animals and endangered species.

Research Background

• The research delves into the exploration of preantral follicles present in ovary tissues of mammals. Preantral follicles, which carry a substantial population of unovulated oocytes, despite their quantity, are considered vital in assisted reproductive technologies (ARTs).
• The study points out that in vitro culture (IVC) is the most widely researched technique for handling these follicles. The process has been successful particularly in mice, leading to offspring production.
• The research highlights that the mare has become an additional model for IVC studies due to its resemblance to women and livestock animals in terms of in vivo and in vitro ovarian folliculogenesis.

In Vitro Culture (IVC)

• In Vitro Culture (IVC) is a technique that involves the cultivation of preantral follicles enclosed in ovarian tissue in a controlled, artificial environment. This method has demonstrated promising results in livestock animals.
• However, the study mentions that the embryo produced from the oocytes from IVC are of low quality and quantity.
• For the efficiency of the IVC system, various factors need to be controlled to provide an ideal culture environment that can sustain the viability and growth of the preantral follicles present in the ovarian tissue.

Cryopreservation

• Cryopreservation is another essential technique discussed in the research. This technique involves low-temperature preservation of ovarian tissue, aiming to preserve its reproductive potential.
• This approach has been beneficial in preserving human ovarian tissue and shows potential for use in valuable domestic animals and endangered species in the future.
• The study emphasizes that several improvements are needed in cryopreservation protocols to support the utilization of ovarian tissue of different species in future assisted reproductive technologies (ARTs) like ovarian fragment transplantation.

Study Objective

• The paper aims to shed light on the current advancements regarding the supportive in vitro techniques used in handling preantral follicles and ovarian tissue in mares. Specifically, the methodologies used during In Vitro Culture (IVC) and the cryopreservation techniques are reviewed.