| Value | Category | Cases | |
|---|---|---|---|
| -97 | Don't know | 23 |
9.6%
|
| 1 | Provides insulation | 13 |
5.4%
|
| 2 | Acts as a cushion | 34 |
14.2%
|
| 3 | Can be substituted for feed | 72 |
30.1%
|
| 4 | Dilutes feces | 97 |
40.6%
|
| a | Not applicable | 0 | |
| b | Don't know | 0 | |
| c | Refused to respond | 0 |