Cloning (embryonic cells) is the splitting of embryos at a really early stage.
This technology is used commercially to increase the number of lambs or calves born following routine embryo transfer or in vitro embryo production. Reports for pigs are really scarce.

Cloning (somatic cells) is a new technology that is currently not being used by European breeding organisations. This is partly for technological and economic reasons, and partly because there is no public approval of such developments at present.


Cloning in Farm Animals