What is the total energy content per kilogram for grain mix B in the supplement-mixes example?

• A. 1.22
• B. 0.40
• C. 1.62
• D. 1.44

Answer: (A)

The main idea is to find the energy per kilogram of a mixed feed by taking a weighted average of the energy densities of all its components. For grain mix B, you multiply how much of each grain is in one kilogram of the mix by that grain’s energy density, then add all those products together. That weighted sum gives the total energy content per kilogram for the mix.

In the supplement-mixes example, doing that weighting with the specified proportions and energy values for the grains in mix B results in 1.22 energy units per kilogram, which is why 1.22 is the correct choice. If you got a different number, it would usually mean some step was done without proper weighting by each grain’s share, or you used a different energy measure (like mixing DE with ME or using a non-per-kilogram basis).