Basis of feed value calculations - Poultry

Agriculture

Energy value of the feeds for poultry

The energy value of the feeds for poultry is expressed as megajoules (MJ) of metabolizable energy (ME). The energy values in Table 1 below are apparent metabolizable energy values corrected to zero nitrogen balance (AMEN, Apparent Metabolizable Energy, N-corrected, poultry). They are calculated based on a method presented by WPSA in 1986, which for many feed gopups is based on the regression equations presented in Table 1.

Example:

Barley, 6-rows,  ME = 9,258 × DM  – 9,258 × Ash + 6,810 × Starch

Table1. The coefficients presented by WPSA to calculate the energy value of feeds for poultry.
No Regression coefficients DM Ash CP Cfat CF Starch Sugar
R1 Barley, 6-rows 9.258 -9.258       6.810  
R2 Barley, 2-rows 9.258 -9.258       7.516  
R3 Oats 12.98 -12.98   48.82 -25.50    
R4 Barley by-products 13.74 -13.74     -35.58 2.913  
R5 Maize by-products 17.72 -17.72 -9.931 11.73 -69.34    
R6 Rice by-products 19.54 -19.54 -29.10 17.97 -34.29    
R7 Wheat by-products 16.78 -16.78     -69.20    
R8 Tapioca 16.38 -16.38     -34.64    
R9 By-products from ethanol production 16.38 -16.38 -4.066   -26.0    
R10 Sunflower by-products (shelled) 2.626 -2.626 10.62 26.2      
R11 Meat and meat-and-bone meals 14.20 -19.15   25.10      
R12 Fish meals 15.01 -14.26   17.61      
E1 Groundnut by-products 12.42     25.50 -25.47    
E2 Cotton seed by-products 8.898     19.72 -12.97    
E3 Sunflower by-products (non-shelled) 11.17     32.30 -21.43    
S By-products from sugar industry             17.32

DM=dry matter, CP = crude protein, Cfat= crude fat, CF=crude fiber

References:
Equations D, R1 – E3: European Federation of Branches of the World’s Poultry Association (1986), Equation S: CVB (1991, 1992)

Energy value of a feed mixture

The energy value of feed mixtures for poultry is presented as nitrogen corrected apparent metabolisable energy. It is calculated based on the EU Regulation (EC 152/2009 annex VII) from the chemical composition of the feed mixture:

ME (MJ/kg) = (15.51 CP + 34.31 CFat + 13.01 sugar + 16.69 starch )/1000,

where feed composition is expressed as g/kg. The acceptable energy value deviation calculated with this equation is ± 0.4 ME MJ/kg.