The world's first "test tube" puppies have been
born after years of attempts, say scientists in the US.
The in-vitro fertilisation success paves the way for
conserving endangered breeds and could help in the fight against human and
animal diseases, say researchers at Cornell University.
The seven beagle and cross-bred beagle-spaniel puppies
were born to a surrogate mother.
They were from the same litter but have three sets of
parents.
Frozen embryos were implanted in a female dog using
techniques similar to those used in human fertility clinics.
Problems with freezing embryos have caused difficulties
in the past, but the group say they have perfected this and other techniques.
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