Abstract: This experiment was conducted to investigate the effects of different levels of lysolecithin (LPL) on growth performance, slaughter performance, meat quality, digestive enzyme activities and nutrient digestibility of Liangfenghua chickens fed with two different energy levels diets. A total of 1 080 healthy 1-day-old Liangfenghua chicken with similar body weight were randomly divided into 6 treatment groups:1) Control group:fed with basal diet; 2) Control+500LPL group:supplement 500 mg·kg^-1 of LPL to the basal diet; 3) Energy-reduced diet group:fed with low energy diet (metabolizable energy decreased by 251 kJ·kg^-1 at basal diet level); 4) Energy-reduced+500LPL group:supplement 500 mg·kg^-1 of LPL to the low energy diet; 5) Energy-reduced + 750LPL group:supplement 750 mg·kg^-1of LPL to the low energy diet; 6) Energy-reduced+1000LPL group:supplement 1 000 mg·kg^-1of LPL to the low energy diet, with 6 replicates in each group and 30 chickens in each replicate, respectively. The experimental period was 52 days, which was divided into starter phase (1~21 days) and grower phase (22~52 days). At the end of the experiment, chickens were slaughtered and sampled to determine certain indexes. The results showed that the F/G of Liangfenghua chicken in the energy-reduced diet group was higher than that in the control group, and after added 750 mg·kg^-1 LPL, the F/G of Liangfenghua chicken was almost the same as that in the control group (P>0.05). Compared with the energy-reduced diet group, LPL addition to the energy-reduced diet groups could improve the breast muscle rate and thigh muscle rate of Liangfenghua chicken on the 52nd day (P>0.05). Compared with the control group, added 500 mg·kg^-1 of LPL to the basal diet significantly improved the digestibility of dry matter and crude protein in the diet of Liangfenghua chickens at 21 d (P<0.05) and the digestibility of ether extract at 52 days (P<0.05). The addition of 750 and 1000 mg·kg^-1LPL to the energy-reduced diet significantly increased the villus height of the ileum and jejunum (P<0.05) and duodenal lipase activity (P<0.05) at 52 d of Liangfenghua chicken compared with the energy-reduced diet group. Compared with the energy-reduced diet group, added 750 mg·kg^-1 LPL to the energy-reduced diet significantly improved the apparent ileal digestibility of 11 amino acids such as Thr, Val, Ala in the diet of Liangfenghua chicken (P<0.05). Compared with the energy-reduced diet group, added 750 and 1 000 mg·kg^-1 LPL to the energy-reduced diet increased the gene expression of apolipoprotein A1 and apolipoprotein A4 (P>0.05). In conclusion, under the certain condition, LPL supplementation to the energy-reduced diets of Liangfenghua chicken can improve the slaughter performance of Liangfenghua chickens, and have a positive effect on its intestinal morphology, nutrient digestibility and liver lipid metabolism, and the addition amount of 750 mg·kg^-1is the best.

Key words: lysolecithin, Liangfenghua chicken, production performance, meat quality, lipid metabolism