Research funding:

The replacement, refinement and reduction (3Rs) in research using animals


The principles of the 3Rs, replacement, refinement and reduction, were originally developed by Professor William Russell and Rex Burch, and are now widely accepted internationally as criteria for humane animal use in research and testing.


To encourage research that seeks to understand, promote and integrate the principles of the 3Rs (Replacement, Refinement and Reduction). Researchers whose focus of research may not be the 3Rs are also encouraged to look for opportunities within their proposed programmes of research to improve animal welfare and/or to integrate the principles of the 3Rs.

Scientific scope

The 3Rs are defined as:

We wish to embed these principles in all the research within our remit involving animal use. We encourage grant applicants, including those whose research does not involve animals but could contribute to reduction and replacement, to consider opportunities to address the 3Rs. Applications that do not exclusively address improvements in the 3Rs will fit this priority if they aim to generate information relating to the 3Rs as part of a larger or related study.

Outputs and impacts

Outputs of 3Rs research are expected to have wide policy and societal impacts including addressing both the Government's priorities in reduction and replacement, and public concerns about the use of animals in research. More specifically there is increasing evidence that aspects of refinement not only benefit animals but can improve the quality of research results. Outputs could also include development of novel replacement, or non-invasive technological refinements that may lead to reductions in the financial costs of research.

Pathways to impacts

In proposing activities during the project to explore possible translational opportunities applicants should demonstrate awareness of policy and societal implications and are advised to consult the National Centre for 3Rs (NC3Rs) website (see external links) which provides a valuable source of information that should be used to ensure maximum value is derived from the research.

BBSRC is one of the funders of the NC3Rs, which provides a UK focus for the promotion, development and implementation of the 3Rs in animal research and testing. The NC3Rs has a 3Rs Research Funding Scheme for hypothesis driven and applied research that will advance knowledge and application of the 3Rs.

Ethical and other issues

Applicants are expected to adhere to the general principles and best practice outlined in the Responsibility in the use of animals in bioscience research guidance (see related links), and the ARRIVE (Animal Research: Reporting In Vivo Experiments) guidelines (see external links).

Applicants should also be aware of the European legislation on the protection of animals used for scientific purposes (Directive 2010/63/EU) and the resulting UK Animals (Scientific procedures) Act 1986 Amendment Regulations 2012

Data sharing

Data and resource sharing are encouraged as part of addressing the 3Rs. Where relevant, applicants should address the shared funders' position statement on sharing and archiving of genetically altered mice (see related links).