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THE RECOVERY, TRANSFER AND SURVIVAL OF BLASTOCYSTS IN PIGS

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