Possibilities for refinement and reduction: future improvements within regulatory testing

Area of Science:

• Toxicology
• Animal Welfare Science
• Regulatory Science

Background:

• Regulatory testing, particularly in the US and Canada, significantly contributes to animal use in painful or distressing procedures.
• There is a growing emphasis on refining (minimizing suffering) and reducing (decreasing numbers) animal use in these tests.

Purpose of the Study:

• To review current approaches and challenges in refining and reducing animal use in regulatory testing.
• To identify areas for improvement and future directions in animal welfare within regulatory science.

Main Methods:

• Review of existing literature and practices in regulatory animal testing.
• Analysis of traditional and novel strategies for refinement and reduction.
• Discussion of technological advancements and international harmonization efforts.

Main Results:

• Refinement strategies, such as humane endpoints, and reduction methods, including tier testing and improved experimental design, are being implemented.
• Technological advancements (telemetry, noninvasive techniques) offer potential to decrease animal demand and suffering.
• International harmonization and coordination are key to further reducing animal use.
• Challenges persist, including limited research funding, differentiating distress from pain, and addressing the overuse of rodents.

Conclusions:

• Despite challenges, significant potential exists for refining and reducing animal use in regulatory testing.
• Continued research, technological innovation, and collaborative efforts are essential for advancing animal welfare in regulatory science.