In the context of energy use in feed formulation, ME is used to estimate energy available for which aspects of maintenance and production?

• A. Maintenance, growth, and production.
• B. Only maintenance.
• C. Only growth.
• D. Maintenance, growth, and production.

Answer: (D)

Metabolizable energy is the portion of the feed’s energy that is actually available to the animal after digestion and metabolic losses. This energy pool is what the animal can allocate to maintenance (basic bodily functions, temperature, activity) and to production (growth and production such as milk or eggs). In feed formulation, ME is used to estimate how much energy is available for both maintenance and production, including growth and lactation, rather than limiting it to just one aspect. That’s why the best answer includes maintenance, growth, and production.