In cloning of cattle a fertilized egg is taken out of the mother's womb and
in the eight cell stage the individual cells are separated under electrical field for further development in culture media
the egg is divided into 4 pairs of cells which are implanted into the womb of other cows
in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
from this up to eight identical twins can be produced