Probiotics are expected to be an ideal alternative for antibiotics in the poultry industry. This study aimed to investigate the effect of Lactobacillus plantarum on growth traits, slaughter performance, serum markers and intestinal bacterial community of Daheng broilers. A total of 2400 healthy one-day-old Daheng broilers were randomly divided into 5 groups with 6 replicates per group and 40 individuals per replicate. Birds in control group were fed a basal diet, and others were fed basal diets supplemented with 10⁵, 10⁶, 10⁷ and 10⁸ CFU/kg Lactobacillus plantarum, respectively. It turned out that adding Lactobacillus plantarum to diet could significantly improve the serum immune performance of broilers (p < 0.05), enhance the antioxidant capacity to a certain extent (p > 0.05), but had no significant effect on growth traits and slaughter performance. Moreover, Lactobacillus plantarum could improve the diversity of intestinal bacterial community, but with the increase of addition concentration, the diversity would gradually decrease. In conclusion, Lactobacillus plantarum can be used as feed additive in broiler production, but whether it is more effective than antibiotics needs further investigation.

中文翻译：

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植物乳杆菌对大横肉鸡生长性状、屠宰性能、血清标志物及肠道菌群的影响

益生菌有望成为家禽业抗生素的理想替代品。本研究旨在探讨植物乳杆菌对大横肉鸡生长性状、屠宰性能、血清标志物和肠道细菌群落的影响。将2400只健康1日龄大横肉鸡随机分为5组，每组6个重复，每个重复40只个体。对照组饲喂基础日粮，其余饲喂分别添加10 ⁵、10 ⁶、10 ⁷和10 ⁸  CFU/kg植物乳杆菌的基础日粮。原来，添加植物乳杆菌日粮可显着提高肉鸡的血清免疫性能（p  < 0.05），一定程度上增强抗氧化能力（p > 0.05），但对生长性状和屠宰性能无显着影响。此外，植物乳杆菌可以提高肠道细菌群落的多样性，但随着添加浓度的增加，多样性会逐渐降低。综上所述，植物乳杆菌可以作为肉鸡生产中的饲料添加剂，但是否比抗生素更有效还有待进一步研究。