Professor Dylan Jones is Pro Vice-Chancellor for Biomedical and Life Sciences at Cardiff University.
He told ITV Cymru Wales that the university's animal research procedures are strictly regulated, 'certainly not cruel' and play an important part in establishing ways to alleviate human suffering.
He conceded that the institution would like to reduce the number of animals used, but said it would be 'some time' before scientists could rely solely on other methods of testing, as some remain 'unsophisticated and unreliable'.
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During a renovation project, Victorian mosaics were found underneath a carpet and a wall memorial dated 1732 was discovered.
A bright and frosty start, with the risk of some icy patches. However cloud will soon spill in from the northwest,
Wales woke to another frosty morning on Saturday after temperatures plunged.