Which of the following best describes NEp?

• A. Energy used for production
• B. Energy used for maintenance
• C. Energy lost as feces
• D. Energy absorbed in the intestines

Answer: (A)

Net energy for production is the portion of energy that can be allocated to productive processes such as growth, milk, or egg production after the animal’s maintenance needs and heat losses have been accounted for. It represents the energy available to drive production, not the energy required just to keep the body functioning. Maintenance energy (the amount needed for daily upkeep) is a separate component, and energy lost in feces or energy absorbed in the intestines are not the energy that remains available for production. So the description that best fits NEp is the energy available for production.