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
Missed tonight's Adrian's Election Adventure? Catch up here
Showers will ease away to leave a dry night. Winds will become fairly strong, especially along the coast.
Celebrations will take place in Wales for the 70th anniversary of VE Day in Wales and we'd like to feature your memories and photos.