Table 1 The number of ear manipulation events based on video recordings of nursery pigs in pens with high- (HPP) and low- (LPP) porcine ear necrosis (PEN) prevalence in farms A, B, and C
From: Porcine ear necrosis in nursery piglets is preceded by oral manipulations of the ear
| Â | Farm | |||
|---|---|---|---|---|
A | B | C | ||
Duration of nursery period (weeks) | 7 | 6 | 7 | |
No. of observations (15Â min) | 8 | 7 | 8 | |
Average no. of pigs/pen | 25 | 33 | 37 | |
No. of pens (total no. of piglets) | HPP | 5 (120) | 5 (168) | 5 (186) |
LPP | 5 (134) | 1 (27) | 2 (73) | |
Total no. of oral manipulations recorded in the pens in all observations | HPP | 826 | 667 | 760 |
LPP | 546 | 59 | 204 | |
The average no. ± SD of oral manipulations/ pen in all observations | HPP | 165.2 ± 17.6 | 133.4 ± 18.3 | 152.0 ± 21.4 |
LPP | 109.2 ± 36.6 | 59 ± 0 | 102.0 ± 3.0 | |
The average no. ± SD of oral manipulations/ pen / 15 min | HPP | 20.6 ± 9.2 | 19.0 ± 7.5 | 19.0 ± 6.1 |
LPP | 13.6 ± 4.1 | 8.4 ± 5.7 | 12.7 ± 6.2 | |
The average no. of oral manipulations/ pig / 15Â min | HPP | 0.87 | 0.57 | 0.51 |
LPP | 0.51 | 0.31 | 0.35 | |