Table 2.
Characteristics of the sample – descriptors of the environment and feeding of the pigs at pen level
| Variables | Number of pens | % | Number of pigs assessed | % |
|---|---|---|---|---|
| Pen type | ||||
| Indoors | ||||
| Kennels | 11 579 | 10.32 | 270 676 | 4.95 |
| Open+internal divisions | 35 252 | 31.41 | 1 527 574 | 27.96 |
| Open plan | 56 767 | 50.58 | 3 288 664 | 60.2 |
| Indoors and outdoors | ||||
| Trobridge | 3584 | 3.19 | 84 224 | 1.54 |
| Kennel+yard | 2088 | 1.86 | 66 698 | 1.22 |
| Outdoors | ||||
| Shelter+field | 1942 | 1.73 | 198 957 | 3.64 |
| Other | 585 | 0.52 | 26 246 | 0.48 |
| Missing values | 443 | 0.39 | 309 | <0.01 |
| Ventilation type | ||||
| Natural | 83 572 | 74.74 | 4 570 736 | 83.66 |
| Powered | 27 385 | 24.49 | 830 028 | 15.19 |
| Missing values | 1283 | 0.77 | 62 584 | 1.15 |
| Pen size | ||||
| Large (⩾200) | 6180 | 5.50 | 1 863 606 | 34.11 |
| Medium (⩾30 to 200) | 65 579 | 58.43 | 2 406 862 | 44.05 |
| Small (<30) | 40 481 | 36.07 | 1 192 880 | 21.83 |
| Feed form | ||||
| Liquid | 18 161 | 16.18 | 521 066 | 9.54 |
| Meal | 25 649 | 22.85 | 853 848 | 15.63 |
| Pellet | 68 404 | 60.95 | 4 088 125 | 74.83 |
| Missing values | 26 | 0.02 | 309 | 0.01 |
| Feed | ||||
| Ad libitum | 101 123 | 90.1 | 5 211 662 | 95.39 |
| Restricted | 11 091 | 9.88 | 251 377 | 4.6 |
| Missing values | 26 | 0.02 | 309 | 0.01 |
| Feeder type | ||||
| Floor | 1377 | 1.23 | 26 161 | 0.48 |
| Hopper | 88 910 | 79.21 | 4 710 744 | 86.22 |
| Trough | 21 927 | 19.54 | 726 134 | 13.29 |
| Missing values | 26 | 0.02 | 309 | 0.01 |