Training for reduction in laboratory animal use.

Area of Science:

• Laboratory animal science
• Animal welfare
• Experimental design

Background:

• The Federation of European Laboratory Animal Science Associations (FELASA) promotes reduction, refinement, and replacement of animals in research.
• Reduction, the use of the minimum number of animals necessary for statistically valid results, is often misunderstood.
• Reduction and refinement are interdependent principles for ethical animal research.

Purpose of the Study:

• To clarify the concept of reduction in laboratory animal science.
• To explain the relationship between reduction, refinement, and experimental variation.
• To highlight the importance of animal welfare in experimental design and data integrity.

Main Methods:

• Conceptual analysis of the principles of reduction and refinement.
• Discussion of factors influencing experimental variation.
• Exploration of the impact of animal welfare on data variability.

Main Results:

• Reduction is defined as using the appropriate number of animals to achieve statistical power, avoiding both under- and over-use.
• Experimental variation, particularly changes in data variability, can significantly impact the appropriate number of animals needed.
• Improved animal welfare, indicated by uniform welfare, is likely to reduce variation across multiple experimental characters.

Conclusions:

• Accurate understanding and application of reduction are crucial for ethical and efficient animal research.
• Minimizing variation through consistent animal welfare is essential for reliable experimental outcomes.
• Focusing on welfare indicators to ensure uniform conditions can indirectly reduce experimental variability and improve the validity of reduction strategies.