Breeding or assisted reproduction? Relevance of the horse model applied to the conservation of endangered equids.

The research article explores the potential of using domestic horses to optimize cryopreservation and embryo production protocols for preservation and conservation of endangered equid species. Given the significant reproduction similarity in the genus Equus, the authors argue that techniques successfully applied in domestic horses can be valuable for conserving biodiversity in rare horse breeds and wild equids.

Endangered Equids and Biodiversity Conservation

• The research begins by highlighting the current endangerment of many wild equid species. It notes that mechanization has significantly reduced the numbers of some old native horse breeds to levels that threaten the survival of these breeds.
• The authors express strong concerns for preserving animal biodiversity, particularly focusing on rare horse breeds. They suggest that Genome Resource Banking, involving the cryostorage of genetic material, could be an effective approach for ex situ conservation.
• However, they also assert that this method should not replace but complement in situ conservation programmes, suggesting a comprehensive approach to biodiversity preservation.

Role of Domestic Horses in Conservation Efforts

• Given the significant reproductive similarities among members of the Equus genus, the research highlights the potential role of domestic horses in optimizing biodiversity conservation protocols.
• The authors argue that various methods successfully applied to domestic horses could be useful for conserving rare horse breeds and wild equids.
• These methods include epididymal sperm freezing, embryo freezing, intracytoplasmic sperm injection, oocyte vitrification, and somatic cell nuclear transfer.

Potential with Low-Quality Semen and Post-Mortem Oocytes

• The article also carries significant implications for the use of lower-quality semen or oocytes retrieved after the death of a mare.
• These findings suggest that Assisted Reproductive Techniques (ART) fertilization may still adequately function even with these non-optimal sources of reproductive material.
• This versatility further increases the potential of these methods in conservation efforts, as high-quality horse breeds or individuals may not always be available.