Embryo transplantation has enabled the development of new technologies associated with the manipulation of eggs and embryos. Techniques have been developed for the maturation and fertilization in vitro of farm animal oocytes and these extend the possibilities for experimentation and genetic manipulation. Identical twins and quadruplets have been produced by micromanipulation of embryonic cells and possibilities for further clonal reproduction through chimaerism or nuclear transplantation are becoming realistic.

C. Polge

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 81–85, 1986
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