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Table 1.

Nitrogen concentrations and assumptions used for estimating nitrogen balance. *BW = body weight (value provided by producer).

Nitrogen
inputs/outputsConcentrationReference
Pig body N = 2.32 to 2.52% Kyriazakis and 
     of BW*     Emmans, 1991 
Feed 2.9% Liao, 1998 
Crop 1.06% Ryusuke et al., 
      2002 
Fruit 0.23% Zhang, 2004 
Ammonium 17% Measured 
    carbonate   
Urea 46% Measured 
Manure 0.6% Measured 
Composting 2.65% Measured 
    manure   
Nitrogen
inputs/outputsConcentrationReference
Pig body N = 2.32 to 2.52% Kyriazakis and 
     of BW*     Emmans, 1991 
Feed 2.9% Liao, 1998 
Crop 1.06% Ryusuke et al., 
      2002 
Fruit 0.23% Zhang, 2004 
Ammonium 17% Measured 
    carbonate   
Urea 46% Measured 
Manure 0.6% Measured 
Composting 2.65% Measured 
    manure   
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