Objective: To investigate the effects of dietary net energy (NE) content on the performance of growing pigs fed low-protein diets supplemented with crystalline amino acids. Materials and methods: A total of 144 barrows (22.96 ± 2.72 kg, Experiment One) or 360 barrows (27.80 ± 3.48 kg, Experiment Two) were assigned to six treatments. Diets in both experiments were based on corn and soybean meal, including an unsupplemented high-crude-protein (CP) diet (19.0% CP, 2.50 Meal NE per kg) and five low-CP diets (4% lower CP) supplemented with lysine,...
