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Asynchronous Embryo Transfer in Ewes.

Nana Yang1, Yiyong Liu2, Jing Zhang1

  • 1College of Animal Science and Technology, Hebei Technology Innovation Center of Cattle and Sheep Embryo, Hebei Agricultural University, Baoding, Hebei, China.

Reproduction in Domestic Animals = Zuchthygiene
|January 9, 2025
PubMed
Summary
This summary is machine-generated.

Embryo transfer in ewes shows that fresh embryo transfers can be asynchronous in space but synchronous in time without impacting pregnancy. Oviductal transfer of frozen blastocysts improved pregnancy rates compared to uterine transfers.

Keywords:
asynchronous transferoviductpregnancysheeputerus

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Area of Science:

  • Reproductive biology
  • Embryology
  • Veterinary science

Background:

  • Embryo transfer (ET) is crucial for livestock breeding.
  • Optimizing ET protocols requires understanding embryo-oviduct/uterine interactions.
  • Asynchronous ET timing and location can affect success rates.

Purpose of the Study:

  • To evaluate the impact of spatially and temporally asynchronous embryo transfer in ewes.
  • To compare the efficacy of oviductal versus uterine transfer for fresh and frozen embryos.
  • To determine optimal developmental stages and recipient synchronization for ET in sheep.

Main Methods:

  • Four experiments involving transfer of fresh and frozen embryos (blastocysts, 2-cell, 8-cell stages) into oviducts or uteri of synchronized ewes.
  • Varying recipient synchronization (Day 2, 3, 6 post-estrus).
  • Assessment of pregnancy and lambing rates post-transfer.

Main Results:

  • Spatially asynchronous but temporally synchronous uterine transfers of fresh cleavage-stage embryos did not compromise pregnancy/lambing.
  • Oviductal transfer of fresh blastocysts was successful.
  • Oviductal transfer of frozen blastocysts significantly increased pregnancy rates compared to uterine transfers.
  • The oviduct may be the optimal microenvironment for frozen embryos in ewes.

Conclusions:

  • Asynchronous ET protocols can be viable for fresh embryos in sheep.
  • Oviductal transfer is superior for frozen blastocysts in ewes.
  • Further large-scale studies are needed to confirm these findings for asynchronous ET in sheep.