Systems of expressing energy value of feedstuffs

SYSTEMS OF EXPRESSING ENERGY VALUE OF FEEDSTUFFS

  • Food evaluation systems are based on digestible, metabolic and net energy.
  • The various systems in vogue are DE, ME, NE, physiological fuel value, total digestible nutrients, starch equivalent, Armsby NE system and Scandinavian food unit system.
  • Actually, the only useful form of energy is Net energy.
  • Although the experimental determination is somewhat tedious, in most of the developed countries, most systems of feed evaluation at present is based on net energy.

Basic unit of energy:

  • Calorie: One calorie is the energy required to raise the temperature of 1g of water to 15.5°C from 14.5°C. 1000 calories = 1Kcal (amount of heat required to raise 1kg of water to 1°C). 1000 Kcal      = 1Mcal or Therm.
  • Joule:The International Union of Pure and Applied Chemistry (IUPAC) advocates to use the term Joule as against Calorie.
    1 calorie = 4.184 joules.

 

Calorie is the energy required to raise the temperature of 1g of water to 15.5°C from 14.5°C.

Last modified: Sunday, 28 August 2011, 10:34 AM