Livestock Slurry Produced and Nutrients Calculator

Livestock Slurry Produced and Nutrients Calculator

Our livestock slurry produced and Nutrients Calculator is an easy-to-use tool designed to calculate the total slurry produced by livestock on your farm, along with the total nitrogen and phosphorus generated.

Inputting the total head of livestock for each type of livestock, with the total amount collected as slurry (%) and the total housing period (0-52 weeks) will generate the total slurry produced, with the total nitrogen and phosphorus levels for your farm.

We have used the baseline RB209 guidelines to generate the total volumes of slurry and the total N&P outputted per annum per livestock type. These figures can be adjusted to match your farm accordingly.

Read our notes on how to use the Livestock Slurry Produced and Nutrients Calculator effectively >

Visitors can download a simple summary in PDF format.

Members can save, print, and edit previously saved Livestock slurry data on our web app >

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Livestock Slurry Produced and Nutrients Calculator >

-Calculate Livestock Slurry Produced and Total N & P-

*Enter the total head of each livestock type, the total amount collected as slurry, and the total housing period in weeks.

Livestock Type No Of Head Total Amount Collected as Slurry (%) Total Housing Period (Weeks) Volume of Excreta (m³/week) Annual N Output Kg per Year Annual P Output Kg per Year Total Slurry Produced Per Week (m³) Total Slurry Produced Per Housing Period (m³) Total N Produced (Kg/year) Total P Produced (Kg/year)
Dairy cow (over 9000 litre milk yield) %
Dairy cow (6000 and 9000 litre milk yield) %
Dairy cow (up to 6000 litre milk yield) %
Dairy heifer replacement (13 months to first calf) %
Dairy heifer replacement (3 to 13 months) %
Beef suckler cow (over 500kg) %
Beef suckler cow (up to 500kg) %
Steer/heifer (over 25 months) %
Steer/heifer (13 to 25 months) %
Steer/heifer (3 to 13 months) %
Bull beef (3 months and over) %
Bull for breeding (over 25 months) %
Bull for breeding (3 to 25 months) %
Calf (up to 3 months) %
Ewe (<60 Kg / Lamb under 6 months) %
Ewe (>60 Kg / Lamb under 6 months) %
Lamb (6 to 9 months) %
Lamb (Over 9 months) %
Total
Total Gallons

Summary Table >

Livestock Slurry & Nutrients Summary
Total Livestock Head:
Total Slurry Produced(m3):
Total Gallons of Slurry Produced:
Total N Produced Per Year:
Total P Produced Per Year:
Farm Area:(Enter Farmed Area in Acres or Hectares Below)
Enter Total Acres (Acres):
Enter Total Hectares (Ha):
Total Gallons Per Hectare (Ha):
Total N Kgs per Ha (Kgs):
Total P Kgs per Ha (Kgs):

Download Summary as PDF >

Amazon Affiliate Disclaimer: Please note that these are affiliate links, which means that if you click on one of the links and make a purchase, We may receive a small commission at no additional cost to you.

What Does the Livestock Slurry Calculator Do?

This tool helps farmers:

  1. Estimate Slurry Volumes: Calculate weekly and annual slurry production based on livestock type, herd size, housing duration, and collection efficiency.
  2. Quantify Nutrient Content: Determine nitrogen (N) and phosphorus (P) levels in slurry, critical for optimizing crop fertilization.
  3. Plan Land Application: Convert slurry volumes to gallons/hectare and calculate nutrient loading rates to meet crop needs and comply with regulations.

Understanding Nitrogen (N) and Phosphorus (P) in Slurry

Nitrogen and phosphorus are the two most valuable nutrients in slurry, but their concentrations can vary significantly.

Factors Influencing Nitrogen and Phosphorus Levels in Slurry

Animal Diet:

  • High-protein diets (e.g., soya, rapeseed) increase nitrogen and phosphorus excretion.
  • Forage quality and supplemental feeds directly impact slurry N and P content.
  • Mineral supplements and phytase enzymes in feed improve P availability, increasing excretion.

Milk Yield:

The table below shows examples of n and p excretion per dairy cow based on different management systems and diets.

Milk Yield (Litres/Year)Annual N Excretion (kg)Annual P Excretion (kg)Notes
Up to 6,00090–11010–14Lower-yield cows; pasture-based diets.
6,000–9,000110–13014–18Moderate yield; balanced concentrate feeding.
Over 9,000130–15018–22High-yield cows; high-protein diets.

Please note: all users must double-check their input and output figures for accuracy and ensure that they are tailored for their own specific farm. Please use RB209 or other government regulatory guidance.