Table 5.
Description and mixed model (MIXED procedure) analysis of the number of pigs surrounding the observer after 1 min [%] (PPSO) according to different categorical influencing variables
| Description | Model | ||||||
|---|---|---|---|---|---|---|---|
| n (# pens) |
mean [%] | std. dev. |
estimator [%] | std. err. |
global F-value |
global P-value |
|
| Group size | |||||||
| 1 (1–12 pigs per pen) | 668 | 52.6 | 25.1 | 43.0 | 6.0 | 20.1 | < 0.0001 |
| 2 (13–20 pigs per pen) | 472 | 50.4 | 19.2 | 38.9 | 6.2 | ||
| 3 (21–35 pigs per pen) | 400 | 43.3 | 15.5 | 30.8 | 6.2 | ||
| 4 (36–50 pigs per pen) | 80 | 30.1 | 11.0 | 20.7 | 6.3 | ||
| 5 (51–100 pigs per pen) | 31 | 23.8 | 9.8 | 17.8 | 7.0 | ||
| 6 (> 100 pigs per pen) | 17 | 10.2 | 5.6 | 0.5 | 7.2 | ||
| Feeding system | |||||||
| 1 (dry feeding) | 31 | 42.2 | 25.1 | 21.4 | 9.3 | 2.2 | > 0.05 |
| 2 (wet feeding) | 800 | 47.5 | 21.3 | 29.4 | 5.1 | ||
| 3 (fully automatic liquid feeding with sensor) | 315 | 42.4 | 19.1 | 23.8 | 5.5 | ||
| 4 (fully automatic liquid feeding without sensor) | 522 | 51.5 | 23.3 | 26.5 | 5.4 | ||
| Ventilation system | |||||||
| 1 (aisle ventilation) | 680 | 48.8 | 22.7 | 28.9 | 6.7 | 1.2 | > 0.05 |
| 2 (perforated air channel) | 526 | 47.6 | 20.8 | 29.2 | 6.7 | ||
| 3 (diffuse fresh air system) | 45 | 36.7 | 20.7 | 23.6 | 7.8 | ||
| 4 (high-velocity ventilation) | 188 | 49.8 | 22.5 | 27.2 | 6.7 | ||
| 5 (slot ventilation) | 175 | 47.5 | 21.3 | 24.7 | 7.0 | ||
| 6 (others) | 21 | 34.9 | 14.2 | 18.8 | 9.1 | ||
| 7 (outside pens) | 33 | 38.9 | 18.9 | 24.5 | 6.2 | ||
| Age group | |||||||
| 1 (1st-6th fattening week) | 908 | 49.9 | 23.2 | 26.7 | 5.7 | 5.1 | 0.0237 |
| 2 (7th–12th fattening week) | 760 | 45.1 | 19.9 | 23.9 | 5.8 | ||
| Control position of the caretaker pre-fattening period | |||||||
| 1 (service corridor) | 1501 | 48.4 | 21.8 | non-est | . | 1.0 | > 0.05 |
| 2 (inside the pen) | 135 | 42.8 | 22.2 | non-est | . | ||
| 3 (others/mixed) | 32 | 33.7 | 19.3 | non-est | . | ||
| Control position of the caretaker middle/end- fattening period | |||||||
| 1 (service corridor) | 1574 | 48.2 | 21.7 | non-est | . | 1.1 | > 0.05 |
| 2 (inside the pen) | 62 | 40.5 | 23.8 | non-est | . | ||
| 3 (others/mixed) | 32 | 33.7 | 19.3 | non-est | . | ||
| Flooring type | |||||||
| 1 (straw) | 9 | 20.4 | 7.6 | 24.6 | 12.9 | 0.8 | > 0.05 |
| 2 (fully slatted concrete flooring) | 1433 | 47.8 | 21.8 | 26.9 | 4.3 | ||
| 3 (partially slatted concrete flooring) | 226 | 48.2 | 22.3 | 24.4 | 4.5 | ||
| Time of day | |||||||
| 1 (08:00–10:59) | 619 | 47.4 | 21.8 | 27.8 | 5.7 | 1.8 | > 0.05 |
| 2 (11:00–13:59) | 509 | 48.5 | 21.4 | 27.6 | 5.6 | ||
| 3 (14:00–16:59) | 423 | 47.3 | 22.5 | 27.7 | 5.9 | ||
| 4 (17:00–19:59) | 63 | 43.2 | 25.9 | 18.1 | 7.0 | ||
| Temperature | |||||||
| 1 (< 15 °C) | 10 | 49.8 | 17.5 | 32.5 | 14.6 | 0.7 | > 0.05 |
| 2 (15–19.9 °C) | 245 | 46.1 | 19.8 | 21.8 | 5.1 | ||
| 3 (20–22.9 °C) | 780 | 47.7 | 21.3 | 23.0 | 4.8 | ||
| 4 (23–26 °C) | 436 | 49.5 | 24.2 | 24.8 | 4.9 | ||
| 5 (> 26 °C) | 181 | 44.5 | 21.5 | 24.3 | 5.0 | ||
PPSO percentage of pigs relative to group size [%] surrounding the observer after one minute)
* study population: 1668 pig groups (pen) from 214 herds