By Miranda Aldersley For Mailonline
Published: 11:47 GMT, 1 March 2019 | Updated: 11:51 GMT, 1 March 2019
Six Labradors have been put down at a Swedish laboratory after the medical trial for dental implants they were being subjected to came to an end.
As part of the testing, each of the black Labradors had more than a third of their teeth extracted and replaced with implants.
The two-year-old animals were killed on Wednesday at the University of Gothenburg that researchers can continue to analyse the effects on their bone, tissue and blood. The team had previously said the dogs must be dead for process.
The Djurrättsalliansen (Animal Rights Alliance) had attempted to prevent Venus, Milia, Mimosa, Luna, Lotus and Zuri being killed at the end of their treatment.
Put down: Pictured are dogs used in a previous experiment. Six Labradors were killed at the University of Gothenburg on Wednesday
Comedian Ricky Gervais and Downton Abbey actor Peter Egan had thrown their weight behind the campaign, which was backed by British activists from the Animal Justice Project.
The Local reported Göran Landberg, Deputy Vice-Chancellor for Research at the university, as saying: 'It's difficult for us to reach a consensus on these issues, but dialogue is important.
'As we see it, animal experiments are still needed in some kinds of research, to develop new medicines and treatment methods and gain basic knowledge.'
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