The apparent ileal digestible (AID) Lys to NE ratio
of the diets was reduced in each subsequent phase
of the experiment to follow a 3-phase feeding system.
For the NP, the ratio was based on the Lys to NE requirements
for boars according to the NRC (2012).
The values for Lys to NE requirements were multiplied
by 0.95 to make sure that the dietary energy concentration
was not limiting the growth performance of the
pigs.