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'.
More top news
A man has been banned from owning a dog after his Staffordshire Bull Terrier cross-breed bit a train guard.
A 31-year-old man has died despite efforts to save him after he became ill while swimming across a river.
Catch up with the latest episode of Coast & Country. This week the team are on Anglesey!