Calculate releases from poultry and pig farms: examples

Change of poultry type or number reared

Use this formula to calculate release when the number and/or type of animal you reared changed during the year

((N x F) x M/12) + ((n x F) x M12) = emissions in kg

Where:

N = number of livestock

n = new number of livestock

F = relevant emission factor

M = months applicable

Example

A broiler farm has 50,000 birds for the first five months of the year and 100,000 birds for the remaining seven months. The ammonia emission factor for broilers is 0.034. The ammonia calculation would be:

((50,000 x 0.034) x5/12) + ((100,000 x 0.034) x 7/12) = 2692kg

Ammonia releases from poultry

Multiply the number of birds by the relevant emission factor

Example 1 - Poultry broilers

50,000 broiler places x emission factor of 0.034 = release of 1,700kg

Example 2 – Poultry layers (manure removal twice a week by manure belt)

20,000 layer places x emission factor of 0.035 = 700kg

If manure is stored on site after removal from the housing, ammonia releases from this must also be reported

So, if 17 tonnes of manure are removed on a belt system,

17 x emission factor of 2.38 = 40.5kg

The total release in this example would be 700 + 40.5 = 740.5kg

Particulate (dust) releases from poultry

Multiply the number of birds by the relevant emission factor

Example

An installation with 50,000 layers in cages

(50,000 x emission factor of 0.05) ÷ 3 = 833kg

Methane releases from poultry

Multiply the number of birds by the relevant emission factor

Example

50,000 broilers x emission factor for poultry manure management of 0.078 = 3900kg

Change of pig type or number reared

Use this formula to calculate release when the number and / or type of animal you rear changed during the year

((N x F) x M/12) + ((n x F) x M/12) = emissions in kg

Where:

N = number of livestock

n = new number of livestock

F = relevant emission factor

M = months applicable

Example

An installation has 800 sows for the first five months of the year and 1000 sows for the remaining seven months. The ammonia emission factor for sows on straw is 4.57.

The ammonia calculation would be:

((800 x 4.57) x 5/12) + ((1000 x 4.57) x 7/12) = 4189kg

Ammonia releases from pigs

Example - Pig housing

A farm which used places for 800 sows and 1500 finishers on straw in the calendar year

(800 x emission factor of 4.57) + (1500 x emission factor of 2.97)

= total release of 8111kg

If manure or slurry is stored within the boundary of the installation, releases from this need to be added to the housing releases

So, for a 43m2 slurry lagoon without a cover,

add (43 x emission factor of 1.4) = 60.2 kg

Total emission from housing and manure storage = 8111 + 60.2 = 8171.2kg

Methane releases from pigs

You will need to report methane from the pigs themselves (enteric fermentation), and from manure storage.

Example

An installation with 800 sows

(800 x emission factor for enteric fermentation of 1.5) = 1200kg

Plus

(800 x emission factor for manure management of 3) = 2400kg

Total emission = 3600kg