the cloned sheep dolly lived as long as three mothers : one provided the egg.
the cloned sheep dolly lived as long as three mothers : one provided the egg.
how long did the cloned sheep dolly live?
three mothers : one provided the egg
on 14 february 2003, dolly was euthanised because 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.
dolly (sheep)
scnt is seen as a good method for producing agriculture animals for food consumption. it successfully cloned sheep, cattle, goats, and pigs. another benefit is scnt is seen as a solution to clone endangered species that are on the verge of going extinct. however, stresses placed on both the egg cell and the introduced nucleus can be enormous, which led to a high loss in resulting cells in early research. for example, the cloned sheep dolly was born after 277 eggs were used for scnt, which created 29 viable embryos. only three of these embryos survived until birth, and only one survived to adulthood. as the procedure could not be automated, and had to be performed manually under a microscope, scnt was very resource intensive. the biochemistry involved in reprogramming the differentiated somatic cell nucleus and activating the recipient egg was also far from being well understood. however, by 2014 researchers were reporting cloning success rates of seven to eight out of ten and in 2016, a korean company sooam biotech was reported to be producing 500 cloned embryos per day.
cloning