The technique of egg transplantation has been used in several species of laboratory animal to study factors involved in reproduction and growth; it has also been applied with considerable success to sheep. In the pig, most of the previous studies using egg transplantation have been principally concerned with the development of a satisfactory technique (Kvasnickii, 1951; Pomeroy, 1960; Hancock & Hovell, 1962; Vincent, Robison & Ulberg, 1964), but the method has been employed to study both migration of embryos (Dziuk, Polge & Rowson, 1964) and the effects of maternal environment on embryonic development (Smidt, 1965). In the above experiments, 2- to 8-celled eggs were transferred to recipients whose oestrous cycles were synchronized. The transplantation of embryos up to 12 days of age has been successful in sheep (Moor & Rowson, 1964, 1966), but transfer of
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