Abstract: 【Objective】 This study aimed to provide data support for the application of restaurant plate leftovers (RPL) in the replacement of corn and soybean meal with reduced feed production and broiler breeding by studying the effects of RPL inclusion ratio on growth performance,slaughter performances,meat quality,immune-organ indices,and serum biochemical indices of broilers in late growing period.【Method】 504 1-day-old White feather broilers were selected and randomly divided into 4 groups,with 6 replicates in each group and 21 broilers in each replicate.In the early stage of the experiment (1 to 21 days of age),the same diet was fed.In the later stage (22 to 42 days of age),four types of diets were designed.The broilers in control group were fed the corn-soybean meal basal diet,and in experimental groups were fed diets inclusion with 10%,20% and 30% RPL (1/2 RPL instead of corn,1/2 RPL instead of soybean meal),respectively.The growth performance of broilers was recorded,slaughter performance,meat quality,immune-organ indices and serum biochemical indices were measured after slaughter at 42 days of age.【Result】 Compared to control group,① The inclusion of 10% and 20% RPL had no significant effect on the growth performances of broilers (P＞0.05),while the inclusion of 30% RPL significantly reduced average body weight,average daily feed intake,average daily gain (P＜0.05),and extremely significantly increased the ratio of feed to gain (P＜0.01).② The inclusion 10% and 20% RPL had no significant effect on the dressing percentage,eviscerated yield percentage,breast muscle rate,and leg muscle rate of broilers (P＞0.05),while inclusion 30% RPL significantly reduced breast muscle rate (P＜0.05).③ The inclusion of different proportions of RPL to the feed had no significant effect on the immune-organ indices of broilers (P＞0.05).The serum IgG content of broilers significantly increased with the inclusion of 10% and 20% RPL (P＜0.05),while the serum SOD activity of broilers was significantly decreased with the inclusion of 30% RPL (P＜0.05).④ The inclusion of different proportions of RPL did not significantly affect the color,drip loss at 24,48 and 72 hours,acidity,cooking loss,and shear force of broiler breast and leg muscles (P＞0.05).【Conclusion】Dietary inclusion of 10% to 20% RPL had no negative impact on broiler growth performances,slaughter performances,meat quality,immune-organ indices,and serum biochemical indices of broilers in late growing period.RPL could replace corn and soybean meal in conventional diets in poultry farming.

Key words: restaurant plate leftovers; broilers; growth performance; meat quality