Apparently the clone, Prometea, was made from skin cells and an empty egg.
Cesare Galli, director of the Laboratory of Reproductive Technology in Cremona, and colleagues created Prometea by fusing the nucleus of a skin cell taken from the mother with an empty egg from another horse. The resulting embryo was returned to the mother's womb after being cultured in the lab.
http://www.newscientist.com/article/...e-is-born.html