Energy requirement AMEn vs AME

[Amir Sohel]

In animal nutrition, AMEn (nitrogen-corrected apparent metabolizable energy) is a refinement of AME (apparent metabolizable energy) that accounts for nitrogen retention, improving the accuracy of energy value assessment in feed formulation.

[Babafemi Adejinmi]

In the last webinar the host spoke alot about AME and AMEn please revert to the lecture….

[Jeffery Escobar]

Most databases containing the nutrient profile of ingredients have AME and the nutrient recommendations from most breeding companies are in AME. Thus, I would recommend using AME. Important: try avoid as much as possible to use AME values for some ingredients and AMEn values for other ingredients in your feed formulation software.

[Edwin Weber Inibi]

Very informative

[Olayiwola Danso]

If your nutrient database provides only AME (Apparent Metabolizable Energy) but broiler strain recommendations are in AMEn (Nitrogen-Corrected Apparent Metabolizable Energy), you need to convert AME to AMEn.

Here’s how:

AME (Apparent Metabolizable Energy) measures total energy available after digestion, but does not account for nitrogen losses in urine.

AMEn (Nitrogen-Corrected Apparent Metabolizable Energy), adjusts for nitrogen losses, providing a more accurate energy value for poultry, especially in diets with high protein.

Conversion formula:

To estimate AMEn from AME, use the formula:<math xmlns=”http://www.w3.org/1998/Math/MathML” display=”block”><semantics><mrow><mi>
</mi></mrow></semantics></math>

<math xmlns=”http://www.w3.org/1998/Math/MathML” display=”block”><semantics><mrow><mi>AMEn = AME − (8.22 × NR​)</mi></mrow></semantics></math>

Where:

N_R = Nitrogen retention (g/g of feed)

8.22 = Correction factor based on energy lost per gram of nitrogen

If nitrogen retention (N_R) is unavailable, a general approximation is:

<math xmlns=”http://www.w3.org/1998/Math/MathML” display=”block”><semantics><mrow><mi>
</mi></mrow><annotation encoding=”application/x-tex”>AMEn \approx AME – 5 \text{ to } 10 kcal/kg</annotation></semantics></math>AMEn = AME − 5 to 10kcal/kg<div>

For standard poultry diets, AMEn is typically 20 – 50 kcal/kg lower than AME, depending on protein content

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[Suresh Bypanahalli]

Scientists at Massey University, New Zealand suggest that feed formulation based on uncorrected AME values could benefit least cost broiler feed formulations. Correcting AME values to zero N retention (AMEn) for modern broilers penalizes the energy value of protein sources and is of higher magnitude for ingredients with higher protein quality.

[Md. Osman Sheikh]

An experiment was conducted to reevaluate the concept of using AME vs. AME(n) values for broiler diets.