10/28/2026
No embryo doesn't automatically mean nothing worked.
When you're working toward a specific breeding goal, hearing that no embryos developed from an ICSI cycle can be disappointing. But in equine reproduction, there's an important distinction between an outcome and what happened throughout the process.
Every stage of ICSI involves complex reproductive biology, and each step provides valuable information.
Here's what that means:
• Not every aspirated follicle will yield a recoverable oocyte (egg).
• Not every recovered oocyte will reach the appropriate stage of maturity for ICSI.
• Not every injected oocyte will fertilize successfully.
• Not every fertilized oocyte will continue developing into an embryo.
This is known as biological attrition, and it's a normal part of equine reproduction, even under carefully controlled laboratory conditions.
While the ultimate goal may be to produce an embryo, the number of follicles aspirated, oocytes recovered, mature oocytes available, and embryos developed all contribute to understanding the process.
And one cycle doesn't necessarily tell the whole story.
Factors specific to the mare, semen, and individual reproductive circumstances can influence outcomes. That's why results should be evaluated with the appropriate veterinary and laboratory professionals, within the context of the broader breeding program.
At Elite Embryo, we believe transparency matters. Understanding what happens at every stage of the ICSI process helps breeders make more informed decisions about their next steps.
Reproductive biology isn't always predictable, but understanding the process makes a difference.