1. Standard values needed to calculate your manure storage capacity requirements and compliance with the livestock manure N farm limit
The standard values in Tables 1 – 4 are calculated from the daily values given in Schedule 1 of the Regulations. You must use these values to calculate:
-
your required manure storage capacity (see
Leaflet 4), and
-
your compliance with the livestock manure N farm limit (see
Leaflet 5).
In the case of permanently housed pigs and poultry, you may use alternative approaches (i.e. ENCASH or sampling and analysis) to derive alternatives to the “Total N produced by livestock” figures in Tables 2 and 3 below.
The Tables also provide figures for the number of animals per hectare that will supply the livestock manure N farm limit of 170 kg N/ha/yr. These figures are to be used as a guide only and to provide a rough indication of how close your farm is to the limit given the number of livestock on your farm.
The figures provided in Tables 2 and 3 are based on an assumed level of occupancy by livestock. If the occupancy on your farm is different to the occupancy values shown in the tables, you should adjust the values of total N produced and volume of excreta using the following equation:
| Actual total N produced/excreta = Standard value (from table) x |
Actual occupancy |
| Standard occupancy |
| Actual volume of excreta = Standard value (from table) x |
Actual occupancy |
| Standard occupancy |
Table 1: Nitrogen and excreta production from cattle
| Cattle |
Total N produced (kg/year)
(notes a, b) |
Volume of excreta (m³/month) |
Animal numbers per ha to comply with maximum N loading (170 kg/ha N per year) |
| 1 calf (all categories) up to 3 months |
1.4 (note c) |
0.21 |
121 |
| 1 dairy cow from 3 months and less than 13 months |
29 (note d) |
0.60 |
5.9 |
| 1 dairy cow from 13 months up to first calf |
61 |
1.20 |
2.8 |
| 1 dairy cow after first calf (over 9000 litres milk yield) |
115 |
1.92 |
1.5 |
| 1 dairy cow after first calf (6000 to 9000 litres milk yield) |
101 |
1.59 |
1.7 |
| 1 dairy cow after first calf (up to 6000 litres milk yield) |
77 |
1.26 |
2.2 |
| 1 beef cow or steer (castrated male) from 3 months and less than 13 months |
28 (note c) |
0.60 |
6.1 |
| 1 beef cow or steer from 13 months and less than 25 months |
50 |
0.78 |
3.4 |
| 1 female or steer for slaughter 25 months and over |
50 |
0.96 |
3.4 |
| 1 female for breeding 25 months and over weighing up to 500 kg |
61 |
0.96 |
2.8 |
| 1 female for breeding 25 months and over weighing over 500 kg |
83 |
1.35 |
2.0 |
| 1 non-breeding bull 3 months and over |
54 |
0.78 |
3.1 |
| 1 bull for breeding from 3 to 25 months |
50 |
0.78 |
3.4 |
| 1 bull for breeding 25 months and over |
48 |
0.78 |
3.5 |
Notes:
-
Includes an allowance for N losses from livestock housing and manure storage.
-
Different units are used for cattle less than 13 months – see notes c & d below.
-
Total N produced (kg) during the two months that the animal is in this category.
-
Total N produced (kg) during the ten months that the animal is in this category.
Table 2: Nitrogen and excreta production by pig places
| Pigs |
Occupancy (%) |
Total N produced
(kg/year)
(note a) |
Volume of excreta
(m³/month) |
Animal places per ha to comply with maximum N loading (170 kg/ha N per year) |
| 1 weaner place, 7 to 13 kg |
71 |
1.0 |
0.03 |
170 |
| 1 weaner place, 13 to 31 kg |
82 |
4.2 |
0.05 |
40.5 |
| 1 grower place, 31 to 66 kg (dry fed) |
88 |
7.7 |
0.10 |
22.1 |
| 1 grower place, 31 to 66 kg (liquid fed) |
88 |
7.7 |
0.18 |
22.1 |
| 1 finisher place, 66 kg and over (dry fed) |
86 |
10.6 |
0.13 |
16.0 |
| 1 finisher place, 66 kg and over (liquid fed) |
86 |
10.6 |
0.26 |
16.0 |
| 1 maiden gilt place, 66 kg and over |
80 |
11.1 |
0.13 |
15.3 |
| 1 sow place, 66 kg and over, with litter, up to 7 kg, fed on diet supplement with synthetic amino acids |
100 |
16.0 |
0.33 |
10.6 |
| 1 sow place, 66 kg and over, with litter, up to 7 kg, fed on diet without synthetic amino acids (low protein diet) |
100 |
18.0 |
0.33 |
9.4 |
| 1 breeding boar place, from 66 kg to 150 kg |
100 |
12.0 |
0.15 |
14.2 |
| 1 breeding boar place, 150 kg and over |
100 |
17.5 |
0.26 |
9.7 |
Notes:
-
N produced in excreta is per pig place and includes an allowance for N losses from livestock housing and manure storage.
Table 3: Nitrogen and excreta production by poultry places
| Poultry |
Occupancy (%) |
Total N produced
(kg/year)
(note a) |
Weight of excreta
(tonnes/month) |
Animal places per ha to comply with maximum N loading (170 kg/ha N per year) |
| 1000 replacement layer pullet places, up to 17 weeks |
89 |
210 |
1.1 |
800 |
| 1000 laying hens in cages, 17 weeks and over |
97 |
400 |
3.5 |
420 |
| 1000 laying hen places, free range1, 17 weeks and over |
97 |
530 |
3.5 (note b) |
320 |
| 1000 broiler places |
85 |
330 |
1.5 |
510 |
| 1000 replacement broiler breeder pullet places, up to 25 weeks |
92 |
290 |
1.1 |
590 |
| 1000 broiler breeder places, 25 weeks and over |
95 |
700 |
3.4 |
240 |
| 1000 turkey places (male) |
90 |
1,230 |
4.3 |
140 |
| 1000 turkey places (female) |
88 |
910 |
3.2 |
190 |
| 1000 duck places |
83 |
750 |
2.5 |
230 |
| 1 ostrich |
100 |
1.4 |
0.05 (note b) |
121 |
Notes:
- N produced in excreta is per 1000 poultry places (except ostriches) and includes an allowance for N losses from livestock housing and manure storage.
- When calculating storage requirements, you should make an allowance for the proportion of time that birds are not housed. Commonly, free range laying hens are housed for 80% – 90% of the time.
Table 4: Nitrogen and excreta production by sheep, goats, deer and horses
| Livestock type |
Total N produced
(kg/year)
(notes a, b) |
Volume of excreta per livestock type (m³/month) |
Animal numbers per ha to comply with maximum N loading (170 kg/ha N per year) |
| 1 lamb, 6 to 9 months |
0.5 (note c) |
0.05 |
340 |
| 1 lamb, 9 months and over, to first lambing, first tupping or slaughter |
0.7 (note d) |
0.05 |
242.8 |
| 1 sheep, less than 60kg, after lambing or tupping. For ewes this includes one or more suckled lambs up to 6 months |
7.6 |
0.10 |
22.4 |
| 1 sheep, over 60kg, after lambing or tupping. For ewes this includes one or more suckled lambs up to 6 months |
11.9 |
0.15 |
14.3 |
| 1 goat |
15.0 |
0.10 |
11.3 |
| 1 deer for breeding |
15.2 |
0.15 |
11.2 |
| 1 deer, other |
12.0 |
0.11 |
14.2 |
| 1 horse |
21.2 |
0.74 |
8.1 |
Notes:
- Includes an allowance for N losses from livestock housing and manure storage.
- Different units are used for lambs – see notes c & d below.
- Total N produced (kg) during the three months that the animal is in this category.
- Total N produced (kg) assuming the animal is in this category for six months.