Table 1.

Pregnancy and delivery rate by donor cell types

Types	No. of embryos transferred	No. of surrogates
		Transferred	Pregnanta	Deliveredb
Cloning	122 ± 29	15	7	5
RE-cloning	123 ± 29	4	3	1

Data were expressed as mean ± standard deviation. Cloning: primary TG cell; RE-cloning: TG cells originated from cloning pig

^aPregnancy was confirmed by gestation sac formation using ultrasound examination at 28 days after embryo transfer

^bNo. of surrogates delivered/No. of surrogates pregnant