ANN 111: Principles of Animal Nutrition and Feed Technology (2+1)

ARMSBY'S NET ENERGY SYSTEM

• Armsby used calorimeter for his NE determination unlike Kellners C-N balance.
• Kellner compared two levels above maintenance and measured energy values of foods for fattening.
• Armsby, however, compared two levels below maintenance – the higher level was close to maintenance – and calculated the NE value of feed by relating the addition of more food to the resultant saving in body tissues.
• As the utilization of ME for maintenance is markedly higher than for fattening the evaluation of the same feedstuff according to Kellner and Armsby leads to different results.
• Armsby expressed the NE value in therms (1 therm = 1 Mcal = 1000 Kcal).