Question to the Home Office:

To ask the Secretary of State for the Home Department, how many unused animals originally acquired for scientific procedures were euthanized in 2023 due to (a) a surplus to requirement and (b) any other reason.

The Annual Statistics of Scientific Procedures on Living Animals, Great Britain 2023 was published on the 11 September 2024. The statistics provide full details on the number of licensed procedures carried out, the species of animals and the purposes for which the procedures have been undertaken.

The 2023 Annual Statistics show that 2.68 million scientific procedures involving living animals were carried out in Great Britain in 2023; this is a decrease of 3% on last year and the lowest number since 2001.

In 2017, the Home Office published additional statistics covering the number of non-genetically altered animals that were bred for scientific procedures but were killed or died without being used in procedures; and the number of animals (genetically altered and non-genetically altered) subject to tissue sampling for the purposes of genotyping. That data is available at: Additional statistics on breeding and genotyping of animals for scientific procedures, Great Britain, 2017. The additional statistics are not presently routinely collected. Future publication of this data is under review.