Numbers of animals
There were less than four million scientific procedures using animals in 2014 in the UK. The figure was 3.87 million. The number of animals used is slightly less as some animals are used more than once. This does not happen often, and is strictly controlled.
The annual number of animal experiments is now about the same as it was 20 years ago, having gone down substantially between 1988 and 1998, but then levelling off and rising until 2014 when the numbers fell.
To put the figures into perspective, although the number of animal procedures increased by one million (over one third) in the 12 years to 2009, UK expenditure on biomedical research more than doubled in real terms over the same period.
The recent rises in animal procedures are mainly due to the increased production and use of animals with genetic modifications or defects (many fall into the 'breeding' category). The numbers of genetically normal animals have been quite level this century.
In 2014 there was a reduction of around 7% in the overall number of procedures.
Trying to estimate the numbers of animals used in research worldwide is difficult because many countries do not provide comprehensive statistics. However, we know that the major centres for research are the USA (about 11 - 25 million animals), EU including the UK (about 12 million animals), and Canada (about 3 million animals). Unfortunately Australia, China, and Japan are the only Western countries that do no report their research statistics.
Please see our other pages that break down the numbers of animals used in UK research according to species and areas of research, and explore the major contribution of more and more GM animals to advances in science and medicine.
The detailed annual government statistical report from the Home Office is also available online.