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Air Emissions from Animal Feeding Operations Current Knowledge, Future Needs (2003) / Chapter Skim
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Appendix D: Nitrogen and Sulfur Contents of Animal Products and Live Animals -- Sample Excretion Predictions
Pages 207-213

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From page 207...
... , manure nutrient output can be estimated from the number of animals of each type and their average production. Since some farms feed more or less of certain nutrients than the National Research Council recommends, a more accurate estimate of manure output can be made by quantifying the actual feed inputs and the export of animal farm products.
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From page 208...
... 2.6 0.17 Finished cattle 2.0 0.13 Mature breeding cattle 2.2 0.15 Live Swine Nursing piglet 2.0 0.13 Growing (6-80% of mature weight) 2.3 0.15 Finished pig 2.0 0.13 Mature breeding pig 2.2 0.15 Live Poultry Starters 2.6 0.17 Growers 2.5 0.17 Finished broiler 2.3 0.15 Layers and breeders 2.4 0.16 CALCULATIONS AND ASSUMPTIONS FOR TABLE D-1 Milk Approximately 93 percent of milk nitrogen is contained in true protein, while the remainder is found in nonprotein components.
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From page 209...
... The curve for cattle was derived by integrating the change in total body protein (protein accretion) and body weight gain predicted by the National Research Council (NRC, 2000)
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From page 210...
... , protein accretion per kilogram live weight gain was calculated according to the model defined by the National Research Council (2000~. For swine, the protein as a percentage of live weight gain (grams per 100 grams of gain)
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From page 211...
... 2.9 6.2 0.31 25.2 Growing (20-120 kg) 10 24.9 1.10 121.7 Bred sow 7.5 25 1.2 126 Lactating sow and piglets 30 113 5.1 360 Boar 8.3 33 1.9 134 Poultry White Egg Layers Growing (avg.
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From page 212...
... Average DMI (dry mater intake) was assumed to be in accordance with National Research Council predictions (NRC, 2001a)
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From page 213...
... Apparent dry matter digestibility was assumed to be 82 percent, and carbon was assumed to represent 41.5 percent of excreted dry matter. Poultry Dry matter intake and protein feeding requirements for typically managed animals were determined (NRC, 19941.
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Key Terms

  • live weight
  • mature weight
  • dry matter
  • mature body
  • weight gain

  • typically managed
  • true protein
  • feeding requirements
  • protein feeding
  • crude protein

  • matter intake
  • managed animals
  • animal products
  • body protein
  • milk production

  • animal type
  • protein accretion
  • protein percentage
  • reported protein
  • protein content

  • egg layers
  • milk crude
  • animal feeding
  • milk nitrogen
  • percent true

  • amino acids
  • average lactating
  • calculated according
  • council recommendations
  • herd milk


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