LITTLE is known about the early development of identical twins in sheep; the only reference which we have been able to find is that of Assheton 1, who reported finding in a ewe a blastocyst with ...

blastocyst culture, and/or cryoconservation), namely, a very early, complete division/duplication of the embryo, so that monozygotic twins each have their own placenta and their own membranous ...