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Which sheep breed served as the surrogate mother for Dolly?
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The surrogate mother that carried Dolly was a Scottish Blackface ewe.1
While Dolly was a Finn Dorset sheep—cloned from the mammary gland cell of an adult Finn Dorset ewe—the researchers at the Roslin Institute used Scottish Blackface ewes as the source for the host egg cytoplasms and as the surrogate mothers for the reconstructed embryos. Out of 13 recipient Scottish Blackface ewes, one successfully carried the pregnancy to term, resulting in the birth of Dolly.12