Table 8.
Comparison of N excretion values (kg/pig) for finishing pigs from Northern Ireland (Anon, 2006) and English (Anon, 2008) Nitrates Directive Action Programmes
| Northern Ireland (Anon, 2006) | England (Anon, 2008)a | NEW VALUES for 184 g/kg CP | NEW VALUES for 169 g/kg CP | |
|---|---|---|---|---|
| Weaner 1 | 0.26 (7 to 18 kg) | 0.09b (7 to 12 kg) | As for DEFRA | As for DEFRA |
| Weaner 2 | 0.46 (18 to 35 kg) | 0.29c (13 to 30 kg) | As for DEFRA | As for DEFRA |
| Grower | Not given | 1.1d (31 to 65 kg) | 1.02 (31 to 65 kg) | 0.87 (31 to 65 kg) |
| Finisher | 2.69 (35 to 105 kg) | 1.45e (66 to 100 kg) | 1.35 (66 to 100 kg) | 1.14 (66 to 100 kg) |
| Total (wean to 100 kg) | 3.41 | 2.93 | 2.77 | 2.39 |
a
Anon (2008) values are generally lower than Anon (2006) as N volatilization has been accounted for
b
Excretion (kg/pig) calculated using Anon (2007) assumptions of occupancy rate and days in accommodation-(365×71%)/21 = 12.3 cycles. Therefore, 1.1/12.3 = 0.09 kg N/pig
c
(365×82%)/21 = 14.3 cycles. Therefore, 4.2/14.3 = 0.29 kg N/pig.
d
(365×89%)/46 = 7.0 cycles. Therefore, 7.7/7.0 = 1.1 kg N/pig.
e
(365×86%)/43 = 7.3 cycles. Therefore, 10.6/7.3 = 1.45 kg N/pig.