Wever, K. E., Geessink, f. J., Brouwer, M. A. E. et al. 2017. A systematic review of discomfort due to toe or ear clipping in laboratory rodents. Laboratory Animals 51(6), 583-600.
Toe clipping and ear clipping (also ear notching or ear punching) are frequently used methods for individual identification of laboratory rodents. These procedures potentially cause severe discomfort, which can reduce animal welfare and distort experimental...