Factors influencing the efficiency of generating genetically engineered pigs by nuclear transfer: multi-factorial analysis of a large data set

Table 1 Data summary

Total no. of transferred SCNT embryos	18,649
Average no. of transferred embryos per recipient	97
Range of transferred embryos per recipient	43-216
No. of different cell sources used for SCNT	4¹
Type of genetic modification
Additive gene transfer (no. of constructs)	14²
Homologous recombination (no. of target genes)	6³
Total no. of recipient pigs	193
Pregnant recipients	109 (56%)
Delivering recipients	85 (78%)
Total no. of cloned offspring	318
Live cloned pigs	243 (76%)
Healthy cloned pigs	97 (40%)

¹ Mesenchymal stem cells, postnatal fibroblasts, fetal fibroblasts, and kidney cells.
² See Table 8 for details.
³ See Table 9 for details.

ISSN: 1472-6750