Table 1.

Cloning efficiencies in domestic livestock

Species	Efficiency per reconstructed oocyte, %	Efficiency per transferred SCNT embryo, %	Refs.
Cattle	1.7	11.5	1
Goat	6	6	2
Horse	0.8	19	3
Pig	0.3	5–13	4, 5
Sheep	0.3	3.4–5.9	6–8

Estimates based on selected publications that provide sufficient datasets to determine cloning efficiencies based both on a per reconstructed oocyte and a transferred embryo basis. Transferred embryos are often highly selected and can represent a very small subset of SCNT embryos produced.