Production and Sex Ratio of Foals After Transfer of Frozen-thawed In Vitro Produced Embryos

In vitro embryo production via intracytoplasmic sperm injection (ICSI) offers a possible solution for donor mares or stallions not suitable for conventional embryo transfer (ET), and embryo yield (1 per OPU) compares favourably to ET. However, the final outcome after transferring frozen-thawed in vitro-produced (IVP) embryos is not well described. The aim of this study was to determine the pregnancy and foaling outcomes after transfer of frozen-thawed IVP equine embryos in a clinical program, using fresh in vivo-recovered embryos as a reference point, and to examine the influence of rate of in vitro embryo development (time from ICSI to blastocyst formation).
Source: Journal of Equine Veterinary Science - Category: Veterinary Research Authors: Source Type: research