The horse was taken to an animal clinic in the area and released back to the owner.

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Dr. Nicholas Dodman, founder of the Tufts Animal Behavior Clinic, said many animal dysfunctions mimic human psychological issues.

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Olive the Ostrich, a cartoon narrated by Mr Harris, and repeats of Rolf's Animal Clinic were no longer being broadcast, the channel's head of publicity, Nicolas Caley, said.

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He said that fuller animal trials were essential before the technique could be transferred into the fertility clinic for humans.

BBC: Gene technology