合生元对蛋鸡生产性能、抗氧化能力、肠道功能 和蛋品质的影响.

[Objectives]The purpose of this study was to investigate the effects of synbiotic on laying performance, antioxidant capacity, intestinal function, and egg quality of laying hens. [Methods]A number of 192 420-day-old Hy-line brown hens were divided into 2 groups with 6 replicates per group and 16 hens each replicate. Birds in the control (Con) group were fed a basal diet, and the synbiotic (Syn) group was fed a basal diet supplemented with 1 000 mg·kg-1synbiotic. The experiment lasted for 60 days. [Results]Compared with the Con group, Syn group significantly increased laying rate (P＜0.05),the contents of serum albumin and high-density lipoprotein cholesterol (P＜0.05),and serum total antioxidant capacity (T-AOC) and liver T-AOC and total superoxide dismutase (T-SOD) activity as well as jejunal mucosal T-SOD activity (P＜0.05) . Compared with the Con group, Syn group significantly increased the contents of immunoglobulin G and secretory immunoglobulin A in jejunual mucosa and immunoglobulin M in ileal mucosa (P＜0.05),and it decreased tumor necrosis factor α content in jejunal mucosa (P＜0.05) . Compared with the Con group, Syn group did not alter muscle thickness, villus height, crypt depth or the villus height/crypt depth in jejunum and ileum (P＞0.05),while the Haugh unit significantly increased in Syn group (P＜0.05) . [Conclusions]Adding 1 000 mg·kg-1synbiotic in the diet of laying hens could improve the antioxidant capacity and intestinal function of laying hens, resulting in the improved production performance and egg quality. [ABSTRACT FROM AUTHOR]