Why did they use 3 sheep to clone dolly?

Dolly the sheep was cloned using three different sheep to optimize the success of the cloning process. One sheep provided the egg cell, another served as the surrogate mother, and the third donated the somatic cell that contained the genetic material. This approach was necessary because the technique of somatic cell nuclear transfer (SCNT) required a viable egg and a suitable host for the developing embryo. By using three distinct sheep, the researchers could effectively combine their contributions to achieve a successful clone.