New Campaign Calls on UK Government to Report on Hidden Population of Animals in Laboratories
On Thursday, April 24th 2025, the animal welfare charity Naturewatch Foundation launched a new campaign aimed at urging the UK Home Office to begin reporting on a hidden population of animals in laboratories – those who are bred for research but never used in experiments.
According to the charity, current UK Government statistics on animals used in scientific procedures do not include those who are bred for research but later killed or die without being used in an experiment. The only time this data has ever been released was in 2017, when it was revealed that an additional 1.8 million animals had been bred and not used in British laboratories. However, no such data has been made publicly available since then.
Naturewatch Foundation fears that potentially hundreds of thousands of additional animals are being bred behind closed doors, completely unaccounted for in official figures. The charity is calling on the Home Office to start routinely collecting and publishing this data, in line with transparency standards adopted in the EU.
In a statement, a spokesperson for Naturewatch Foundation said, “The British public is rightly concerned about the use of animals in experiments, but many people will be shocked to learn that even more animals are confined and killed in labs each year without being used in experiments and without anyone even knowing about them. Every animal’s life matters and it’s unacceptable that these sentient animals are completely invisible.”
In the EU, the number of animals bred and not used is reported every five years. In 2022, over 18.8 million animals were either used in experiments or bred for research across the 27 EU member states and Norway, with just as many animals being bred and not used as those used in procedures. This included over 7.6 million mice, over 6,000 hamsters, 304 dogs, 211 equines, and 44 baboons.
Reasons for animals being bred and not used include being the wrong sex for a study, being used for breeding or tissue collection, being bred as surplus to ensure availability, or dying before procedures took place.
Naturewatch Foundation has written to the Home Office urging them to start recording and reporting this information. The charity is also calling on members of the public to help by contacting their MPs about the issue.
For further information, please contact:
Media queries:
Alice Williamson
Campaigns & Marketing Assistant
Naturewatch Foundation
alice@naturewatch.org
+44 (0) 1242 252 871
Campaign queries:
Natalie Harney
Campaign Manager
Naturewatch Foundation
natalie.harney@naturewatch.org
+44 (0) 1242 252 871
About Naturewatch Foundation:
Naturewatch Foundation is a UK-based animal welfare charity dedicated to ending cruelty and improving the lives of animals through campaigning, education, and advocacy. For over 30 years, the charity has led initiatives to tackle illegal and unethical practices, including puppy farming, animal experiments, and wildlife crime. By working with policymakers, enforcement agencies, and the public, Naturewatch Foundation strives to make the world a kinder place for animals. Visit naturewatch.org to find out more.
Notes for editors:
– The Home Office releases annual statistics about animals used in scientific procedures in Britain at https://www.gov.uk/government/collections/statistics-of-scientific-procedures-on-living-animals. The latest figures relate to 2023 and report that 2,681,686 scientific procedures were carried out on animals and 2,605,528 animals were used in procedures for the first time in that year.
– Additional statistics released about 2017 report the number of animals bred and not used in Britain at https://www.gov.uk/government/statistics/additional-statistics-on-breeding-and-genotyping-of-animals-for-scientific-procedures-great-britain-2017. An additional 1,810,091 animals were bred and were either killed or died without being used in scientific procedures that year. This included 1,445,366 mice, 5,927 rabbits, 97 beagles, 87 sheep, and 143 primates. In total, these additional figures report 5,533,145 animals were used in science overall in Britain in 2017.
– In the EU, additional statistics about the number of animals bred and not used are reported every five years. The latest available data related to 2022 is available at https://d8aaf127-0203-427a-b8b6-1f1b942cd1af.usrfiles.com/ugd/d8aaf1_3673afd6252b4ebe824da451eb1f8c53.pdf. In 2022, 9,572,759 animals were bred and killed without being used in procedures in the EU’s 27 nations and Norway. 9
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