Abstract:The aim of the study was to investigate the effects of dietary energy and protein levels on growth performance and meat quality trait so as to find the suitable dietary energy and protein levels of China Rongchang (CRP) strain’s roast sucking pigs. The experiment was designed by 2×3 factorial arrangement with two energy levels (14.10 and 15.06 MJ/kg) and three protein levels (16%,18% and 20%). One hundred and twenty healthy weanling pigs with average body weight of (5.01±0.73) kg were randomly allotted to 6 groups, and each group had 4 replicates with 5 pigs per replicate. The experiment lasted for 21 days. The results showed that: 1) dietary energy levels significantly affected ADG (P=0.006) and F/G (P=0.030), and growth performance in high energy level group was greater than that in low energy level group; the dietary protein levels significantly affected ADG, ADFI and F/G (P<0.05), and growth performance in 18% protein level group was greater than that in 16% and 20% protein level groups; there was significant interaction between dietary energy and protein levels on ADG (P=0.021), and no significance was found in other growth performance indices; 2) the dietary energy level significantly affected the muscle CP content and cooking loss (P<0.01), and significant difference was found in total color matter and muscle fiber density (P<0.05); the dietary protein levels significantly affected the muscle CP, intramuscular fat and cooking loss (P<0.01), and no significance was found in other meat quality indices; there was significant interaction between dietary energy and protein levels on CP, muscle fiber diameter and density (P<0.01), and the interaction had significant effects on total color matter and cooking loss (P<0.05). In conclusion, the dietary energy and protein levels obviously affected the growth performance and meat quality trait of CRP strain’s roast sucking pigs, and optimal dietary energy and protein level was 15.06 MJ/kg and 18%, respectively.［Chinese Journal of Animal Nutrition, ２００9，２1（5）:634-639］