Standard housing vs. environmental enrichment (N = 228 BC, N = 96 AC).

This dilemma was based on the known impact of nesting material on the phenotype of animal models of neurodegeneration, and on the legal requirement to provide environmental enrichment. For each of the two sub-groups (i.e. those preferring standard housing and those favouring environmental enrichment) a list of possible justifications was provided. Respondents were asked to choose from (one or more) or these, or to select an open-ended ‘other’ option. Values in the table are percentages of respondents choosing each justification within the relevant sub-group of respondents.