Table 1.
Attempted actions to facilitate group housing of male mice. Given is the number of answers within each category.
| Effect on Aggression | |||||||
|---|---|---|---|---|---|---|---|
| Attempted Actions | Considerably Reduced | Slightly Reduced | No Effect | Slightly Increased | Considerably Increased | Not Tested | Do Not Know |
| Establish groups before sexual maturity | 35 | 17 | 13 | 0 | 0 | 11 | 19 |
| Transfer old nesting material to new cages | 15 | 31 | 14 | 4 | 0 | 5 | 26 |
| Transfer old enrichment to new cages | 15 | 30 | 17 | 2 | 0 | 6 | 25 |
| Provide extra nesting material | 13 | 28 | 20 | 0 | 0 | 8 | 26 |
| Provide a house/shelter | 9 | 32 | 12 | 4 | 3 | 6 | 29 |
| Provide tunnels | 1 | 24 | 17 | 1 | 3 | 24 | 25 |
| Provide additional environmental enrichment | 3 | 15 | 14 | 0 | 1 | 35 | 27 |
| Handle males and females separately | 8 | 9 | 11 | 0 | 0 | 39 | 28 |
| Avoid enrichment that causes competition | 5 | 12 | 8 | 0 | 0 | 41 | 29 |
| Use special routines during experimental procedures | 9 | 5 | 9 | 0 | 0 | 43 | 29 |
| Transfer old bedding to new cages | 2 | 12 | 15 | 2 | 2 | 38 | 24 |
| Provide chewing sticks | 1 | 11 | 31 | 1 | 1 | 21 | 29 |
| Enable food-seeking behavior to some degree | 0 | 12 | 15 | 1 | 1 | 40 | 26 |
| Provide a shelf/balcony | 2 | 5 | 5 | 0 | 1 | 59 | 23 |
| Provide an exercise wheel | 2 | 3 | 5 | 0 | 3 | 60 | 22 |
| Provide scented enrichment (a scent to prevent fighting) | 2 | 3 | 2 | 0 | 0 | 65 | 23 |