A method for producing piglet is provided to be able to increase the normal birth rate of cloned pig by co-transplantation of in vitro fertilization and somatic cell cloned fertilized eggs, significantly shorten the culturing period of the fertilized egg and improve the normal birth rate from a small number of ova. A method for producing piglet comprises the steps of: (a) culturing collected immature ova of slaughtered pig; (b) after preparing (i) a fertilized egg obtained by in vitro fertilization of the mature ova prepared by the step(a) and liquid semen, and (ii) a somatic cell transplanted fertilized egg obtained by transplanting a donor somatic cell into an enucleated prepared mature ova prepared by enucleating the mature ova of the step(a), respectively culturing (i) and (ii) for 16-36 hours; and (c) transplanting 150-250 fertilized eggs prepared by the in vitro fertilization and the somatic cell transplantation into one surrogate mother. Further, a culture ground of the immature ova contains 2-6 follicle films having 4-6 mm of size.
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