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Effect of an asynchronous environment on embryonic development in sheep
Journal of Reproduction and Fertility
|January 1, 1981
Summary
Sheep embryo implantation fails when transferred to asynchronous recipients. However, embryos transferred after a 3-day delay show accelerated development but retain implantation ability, unlike those delayed by 6 days.
Area of Science:
- Reproductive Biology
- Embryology
- Animal Science
Background:
- Embryo transfer success depends on uterine receptivity.
- Asynchronous environments can negatively impact embryo development and implantation.
Purpose of the Study:
- To investigate the impact of recipient synchrony on sheep embryo implantation.
- To determine how delayed transfer to a synchronous recipient affects embryo development and viability.
Main Methods:
- Sheep embryos were transferred to recipients at varying stages of oestrus relative to donors.
- Embryos were subsequently transferred to a second, synchronous recipient after a defined period.
- Embryo development and implantation success were assessed.
Main Results:
- Embryos transferred to recipients 3 days before or after the donor's oestrus failed to implant.
- Embryos held in an advanced recipient for 3 days showed accelerated development but could still implant.
- Embryos held for 6 days were significantly stimulated and showed reduced implantation success in the second recipient.
Conclusions:
- Uterine-embryo asynchrony is a critical factor inhibiting implantation in sheep.
- Short delays (3 days) in advanced recipients can accelerate development without compromising implantation.
- Longer delays (6 days) lead to overstimulation and impaired implantation capacity.