This study was conducted to investigate the effects of 1,8-cineole on antioxidant capacity, immunity, and intestinal health of broilers. A total of 540 1-day-old Arbor Acres (AA) male broilers were randomly divided into five treatments with six replicates per treatment, and 18 broilers per replicate for 42 days. Dietary treatments were a corn–soybean meal basal diet supplemented with 0, and 10, 20, 30, and 40 mg/kg 1,8-cineole, respectively. Dietary supplementation with 20~30 mg/kg of 1,8-cineole increased the ADG from d 22 to 42 and d 1 to 42 (p < 0.05), and decreased the FCR (p < 0.05). Dietary supplementation of 10~40 mg/kg of 1,8-cineole increased total antioxidant capacity (TAOC) in serum (p < 0.05), and decreased malondialdehyde (MDA) level in the liver on day 21 (p < 0.05). The supplementation of 20~30 mg/kg of 1,8-cineole increased the activity of total superoxide dismutase (T-SOD) in the serum and liver and TAOC in the serum and the liver (p < 0.05), and decreased the level of MDA in the serum and the liver (p < 0.05) on day 42. Dietary supplementation with 20~30 mg/kg of 1,8-cineole increased serum immunoglobulin A, immunoglobulin G, and immunoglobulin M contents on day 21 (p < 0.05). On day 21, dietary supplementation of 20~30 mg/kg of 1,8-cineole increased the VH and VH/CD (p < 0.05) in the jejunum and ileum. The supplementation of 20~30 mg/kg of 1,8-cineole increased the content of secretory immunoglobulin A in the duodenum and ileum mucosa on d 42 (p < 0.05). In conclusion, dietary supplementation of 1,8-cineole improves the growth performance of broilers by enhancing antioxidant capacity, immunity, and intestinal morphology.

中文翻译：

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日粮中添加 1,8-桉树脑对肉鸡生长性能、抗氧化能力、免疫力和肠道健康的影响

本研究旨在调查 1,8-桉树脑对肉鸡抗氧化能力、免疫力和肠道健康的影响。将总共​​ 540 只 1 日龄 Arbor Acres (AA) 雄性肉鸡随机分为五个处理，每个处理六个重复，每个重复 18 只肉鸡，持续 42 天。日粮处理为玉米-豆粕基础日粮，分别补充 0、10、20、30 和 40 mg/kg 1,8-桉树脑。膳食补充 20~30 mg/kg 1,8-桉树脑可将 ADG 从第 22 天增加到第 42 天和第 1 天增加到第 42 天 (p < 0.05 )，并降低 FCR ( p < 0.05)。膳食补充 10~40 mg/kg 的 1,8-桉树脑可增加血清中的总抗氧化能力 (TAOC) ( p< 0.05)，并在第 21 天降低肝脏中的丙二醛 (MDA) 水平 ( p < 0.05)。补充 20~30 mg/kg 1,8-桉树脑可增加血清和肝脏中总超氧化物歧化酶 (T-SOD) 的活性以及血清和肝脏中的 TAOC ( p < 0.05)，并降低水平第 42 天血清和肝脏中的 MDA ( p < 0.05)。膳食补充 20~30 mg/kg 1,8-桉树脑在第 21 天增加血清免疫球蛋白 A、免疫球蛋白 G 和免疫球蛋白 M含量( p < 0.05）。在第 21 天，膳食补充 20~30 mg/kg 的 1,8-桉树脑增加了 VH 和 VH/CD（p< 0.05) 在空肠和回肠中。补充20~30 mg/kg 1,8-桉树脑在第42天增加了十二指肠和回肠粘膜中分泌性免疫球蛋白A的含量（p < 0.05）。总之，在日粮中添加 1,8-桉树脑可通过增强抗氧化能力、免疫力和肠道形态来改善肉鸡的生长性能。