In cloning of cattle a fertilized egg is taken out of the mother's womb and
In the eight-cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
Cloning is the process of producing similar populations of genetically identical individuals. So to obtain genetically identical individuals a fertilized egg is taken out of mother' womb and in the eight-cell stage, the embryonic cells are separated, cultured until small embryos are formed. All these 8 embryos formed are identical, they are now implanted into the wombs of other cows.
In the eight cell-stage, the individual cells are separated using enzymes and not under an electric field.
From the eight cell-stage, up to 8 identical calves can be produced and not twins.
Each cell from the 8-cell stage can be potentially used to form an embryo and need not be divided into 4 pairs of cells.