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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