DEAD: ON THIS DATE
Dolly (aged 6)
Cloned female sheep
Dolly (5 July 1996 – 14 February 2003) was a female domestic sheep, and the first mammalcloned from an adult somatic cell, using the process of nuclear transfer.
DEATH: On 14 February 2003, Dolly was euthanisedbecause she had a progressive lung disease and severe arthritis. A Finn Dorset such as Dolly has a life expectancy of around 11 to 12 years, but Dolly lived 6.5 years. A post-mortem examination showed she had a form of lung cancer called ovine pulmonary adenocarcinoma, also known as Jaagsiekte, which is a fairly common disease of sheep and is caused by the retrovirus JSRV.Roslin scientists stated that they did not think there was a connection with Dolly being a clone, and that other sheep in the same flock had died of the same disease. Such lung diseases are a particular danger for sheep kept indoors, and Dolly had to sleep inside for security reasons.