Table 11 Ammonia content and air velocity during the rearing period (R) and the fattening period (F) measured at weekly intervals at four (rearing) or six (fattening) locations in the unit
From: Provision of straw by a foraging tower –effect on tail biting in weaners and fattening pigs
Batch | Period | Ammonia [ppm] | Air velocity [m/s] | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
n | mean | min | max | SD | n | mean | min | max | SD | ||
1 | R | 10 | 9.65 | 0.00 | 20.50 | 7.82 | 10 | 0.08 | 0.05 | 0.12 | 0.02 |
1 | F | 8 | 5.58 | 0.00 | 10.00 | 3.94 | 9 | 0.18 | 0.10 | 0.55 | 0.14 |
2 | R | 6 | 6.96 | 4.25 | 8.50 | 1.54 | 6 | 0.05 | 0.04 | 0.08 | 0.02 |
2 | F | 13 | 22.50 | 6.83 | 43.67 | 11.00 | 12 | 0.09 | 0.06 | 0.12 | 0.02 |
3 | R | 7 | 9.39 | 6.00 | 14.50 | 3.57 | 6 | 0.05 | 0.04 | 0.07 | 0.01 |
3 | F | 12 | 10.57 | 5.17 | 15,83 | 3.81 | 12 | 0.10 | 0.05 | 0.19 | 0.04 |
4 | R | 6 | 9.04 | 2.75 | 19.5 | 5.54 | 6 | 0.07 | 0.05 | 0.10 | 0.02 |
4 | F | 8 | 6.29 | 1.30 | 11.10 | 2.89 | 9 | 0.15 | 0.09 | 0.21 | 0.04 |