Determination of optimal energy system and level for growing pigs

This study mainly evaluated the responses in growth performance of growing pigs to different energy systems and levels diets. Subsequently, we compared nutrient digestibility digestible concentrations each level diet. In experiment 1, a total 144 with an average initial body weight 26.69 ± 7.39 kg were randomly allotted six dietary treatments (four pigs/pen; replicates/treatment) according 2 × 3 factorial arrangement resulting from two (metabolizable [ME] net [NE]) three (low [LE], recommended [C], high [HE]). Pigs fed experimental diets for 6 weeks allowed free access feed water during period. 2, 12 27.0 1.8 individual metabolism crates replicated Latin square design. The identical those used trial. their respective at 2.5 times estimated requirement maintenance per day, this was divided into equal meals provided twice day Differences had no significant effect on or (except AEE) current study. However, ether extract, acid-hydrolyzed acid detergent fiber (g/kg dry matter [DM]) significantly increased (<italic>p</italic> < 0.05) increasing levels. Additionally, there tendency = 0.09) increase crude protein content DM) as diet increased. Consequently, differences did not affect weight, daily gain, intake pigs. implies that higher variation may be required when considering concentrations.