Quote: When you look at a feedstuff analysis they have the energy broke down into types.
For the most part (for poultry) you have Net Energy (NE), Digestible Energy (DE), Metabolizable Energy (ME), Net Energy Maintenance (NEm). and Net Energy Growth (NEg).
Net Energy (NE) refers to the amount of feed energy actually available for animal maintenance, growth and production. Conceptually, total NE is the portion of metabolizable energy (ME) remaining after the energy expended in body heat (or “heat increment of feeding”).
Net Energy Growth (NEg) is an estimate of the energy in a feed used for body weight gain once maintenance is achieved.
Net Energy Maintenance (NEm) is an estimate of the energy in a feed used to keep an animal in energy equilibrium, neither gaining weight nor losing weight.
Metabolizable energy (ME) equals the gross feed energy minus the energy lost in the feces, urine and gaseous product of digestion.