Test-tube foals born from frozen embryos are no longer the latest news in equine reproduction. Not since a team at Ghent University in Belgium—led by professor Ann Van Soom, Nerea Ortiz Escribano, PhD, and Katrien Smits, DVM, PhD—welcomed VICSI, the world’s first foal born from a frozen, immature oocyte (egg).
“Previously, foals have been born from frozen oocytes,” Dr. Smits says. “But those were partially matured in the mare. So, it is the combination of freezing an immature oocyte and total in vitro production of the equine embryo after warming of the oocyte which is novel.”
Specifically, the Belgian team used two techniques, which also were combined to form the colt’s name. One was vitrification, a method of cryopreservation (freezing) that rapidly cools the oocyte in such a way that…