240 of 37-week-old laying hens were randomly divided into 4 groups, with 6 replicates per group and 10 hens per replicate. They were fed basal diet with 0, 0.02%, 0.04% and 0.06% quercetin. The effects of quercetin on performance, reproductive organ, hormone and expression of genes associated with apoptosis in laying hens, and the possibility of quercetin as functional feed additives was explored.The results about performance, reproductive organ, hormone and apoptotic genes showed that:(1)PerformanceCompare...