The New Zealand Anti-Vivisection Society will run a 12-day campaign highlighting animal experiments done by University of Otago researchers.
But the university says at least some of the society's allegations are based on old experiments, no longer performed at the university.
Society executive director Tara Jackson said force-feeding alcohol to young rats was one of about a dozen allegedly "unethical" experiments on animals conducted at the university, and details of more would be publicised over the next 10 days as part of the society's 12 Days of Christmas campaign.
Deputy vice-chancellor Prof Richard Blaikie said the allegation about force-feeding alcohol to rats related to a study undertaken in 2010 that investigated the impact of alcohol on the adolescent brain.
"The university is confident that any adverse events that occurred during this research were addressed through our animal welfare office and the ethical compliance channels at the time."