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Guidelines for farmers in nitrate vulnerable zones
Table D: Standard figures for total nitrogen produced as livestock excreta
Stock Unit | Number of stock units | Total N excreted by 1 stock unit (kg/year) | Total N excreted by all stock (kg/year) |
1 Dairy Cow (650kg) | | x 116 = | |
1 Dairy Cow (550kg) | | x 96 = | |
1 Dairy Cow (450kg) | | x 76 = | |
1 Dairy heifer replacement over 24 months (500kg) | | x 58 = | |
1 Suckler Cow | | x 58 = | |
1 Cattle grower/fattener over 24 months (500kg) | | x 58 = | |
1 Cattle grower/fattener 12-24 months (400kg) | | x 47 = | |
1 Young cattle 6-12 months | | x 12 = | |
1 Bull beef cattle 6-13.5 months | | x 23 = | |
1 Calf (to 6 months)
1 | | x 7 = | |
1 Bull for breeding (1,350kg, alter figures for breed) | | x 58 = | |
1 Sheep | | x 9 = | |
1 Fattening Lamb 6-12 months
1 | | x 3.2 = | |
1 Fattening Lamb 0-6 months
1 | | x 1.2 = | |
1 Breeding Sow place (includes piglets to 3.5 weeks) | | 19.5 = | |
1 Maiden gilt place
2 | | 3 = | |
1 Boar place | | x 16 = | |
For pigs fattened from 3.5 weeks | | | |
- Number of pigs finished at 7.5 weeks/18kg | | x 0.28 = | |
- Number of pigs finished at 11 weeks/35kg
3 | | x 0.77 = | |
- Number of pigs finished at 20 weeks/85kg
3 | | x 2.5 = | |
- Number of pigs finished at 23 weeks/105kg
3 | | x 3.36 = | |
For pigs fattened from 7.5 weeks: | | | |
- Number of pigs finished at 11 weeks/35kg
3 | | x 0.49 = | |
- Number of pigs finished at 20 weeks/85kg
3 | | x 2.22 = | |
- Number of pigs finished at 23 weeks/105kg
3 | | x 3.08 = | |
1,000 Laying Hens (98% occupancy) | | x 660 = | |
1,000 Broiler Places (76% occupancy) | | x 495 = | |
1,000 Broiler Breeder (77% occupancy) | | x 975 = | |
1,000 Pullets (38% occupancy) | | x 125 = | |
1,000 Male Turkeys Places (140 days)
4 | | x 1,390 = | |
1,000 Female Turkeys Places (120 days)
5 | | x 650 = | |
1,000 Fattening Duck Places (50 days)
6 | | x 900 = | |
| Total N produced F = | |
1 Presumes kept for only 6 months.
2 Average number on unit at any time during the year.
3 Total number normally finished in a year assuming pigs are on the farm from 3.5 weeks or 7.5 weeks. Figures for pigs finished after import at other ages can be calculated by subtraction. Eg if pigs are imported at 35kg and kept until 105kg subtract total N produced by pigs finished at 35kg (0.77) from total N produced by pigs finished at 105kg (3.36) and use the figure of 2.59 in column 3.
4 Male turkeys, assuming 2.1 crops per year; 80% occupancy.
5 Female turkeys, assuming 2.4 crops per year; 80% occupancy.
6 Ducks, assumes 80% occupancy.
Include cockerels, drakes etc in hen/duck numbers.
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