Plant extracts have been proved as natural antioxidants resources as well as alternative feed additives in livestock and poultry species. Chestnut wood extract (CWE) as a source of hydrolysable tannic acid was used to evaluate the growth performance, nutrient retention, meat quality, antioxidant status, and immune function of broilers. A total of 168, day-old Arbor Acre male broilers (weight 46.59 ± 0.44 g) were randomly divided to 3 treatments, 7 replicate pens per treatment, 8 broilers per pen. The treatments contain a control diet, CON (corn-soybean meal basal diet); an antibiotic diet, CTC (basal diet + 75 mg/kg chlortetracycline); and chestnut wood extract diet, CWE (basal diet + 1,000 mg/kg chestnut tannins). At the finisher phase, final body weight was higher (P < 0.05) in CWE supplemented diet than in CON. Average daily body weight gain was higher (P < 0.05) and feed gain ratio was lower (P < 0.05) in broilers fed CWE than in those fed CON at the finisher phase. Crude protein digestibility was higher (P < 0.05) in broilers offered CWE than that in broilers fed CON and CTC diets. Breast muscle pH value at 24 h (pH24 h) was higher (P < 0.05) in broilers fed CWE than that in those fed CON and CTC diets. The bursa weight was higher (P < 0.05) in broilers offered CWE than that in those fed CON and CTC. Total antioxidant capacity (T-AOC), glutathione peroxidase (GSH-Px), and superoxide dismutase (SOD) values were higher (P < 0.05) in both breast muscle and thigh muscle of broilers offered CWE supplemented diet than those in broilers fed CON and CTC diets. Similarly, broilers offered with CWE diets showed higher (P < 0.05) T-AOC, GSH-PX, and SOD value in serum than those fed CON and CTC diets. Serum concentration of IgG was higher (P < 0.05) in broilers offered with CWE diets than that in those fed CON and CTC diets. Total cholesterol, low-density lipoprotein cholesterol, and urea-N concentration were lower (P < 0.05) in broilers offered CWE diet than those in broilers fed CON and CTC diets. It was recommended to supply CWE at the 1,000 mg/kg level for improving antioxidant status, cholesterol metabolism, and growth performance without affecting normal meat quality in broilers.

中文翻译：

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板栗木提取物对肉鸡生产性能，肉质，抗氧化状态，免疫功能和胆固醇代谢的影响。

植物提取物已被证明是天然抗氧化剂资源，也是牲畜和家禽物种的替代饲料添加剂。栗木提取物（CWE）作为可水解单宁酸的来源用于评估肉鸡的生长性能，养分保留，肉质，抗氧化剂状态和免疫功能。总共168只日龄的Arbor Acre雄性肉鸡（体重46.59±0.44 g）被随机分为3个处理，每个处理7个重复用钢笔，每个钢笔8个。治疗包括对照饮食，CON（玉米豆粕基础饮食）；抗生素饮食，四氯化碳（基础饮食+ 75毫克/千克金霉素）；和栗木提取物饮食，CWE（基础饮食+ 1,000 mg / kg栗单宁）。在肥育阶段，CWE补充饮食的最终体重高于CON饮食（P <0.05）。在育肥阶段，饲喂CWE的肉鸡的平均日增重较高（P <0.05），而饲喂增重率则较低（P <0.05）。提供CWE的肉鸡的粗蛋白消化率高于饲喂CON和CTC日粮的肉鸡。饲喂CWE的肉鸡在24 h（pH24 h）的胸肌pH值高于饲喂CON和CTC的肉鸡（P <0.05）。提供CWE的肉鸡的法氏囊重量高于饲喂CON和CTC的肉鸡（P <0.05）。饲喂CWE的肉鸡的胸肌和大腿肌肉的总抗氧化能力（T-AOC），谷胱甘肽过氧化物酶（GSH-Px）和超氧化物歧化酶（SOD）值均高于（P <0.05），而饲喂CON的肉鸡和四氯化碳饮食。同样，使用CWE日粮的肉鸡显示更高的（P <0.05）T-AOC，血清中的GSH-PX和SOD值高于CON和CTC日粮。CWE日粮提供的肉鸡血清IgG浓度高于CON和CTC日粮的肉鸡（P <0.05）。提供CWE日粮的肉鸡总胆固醇，低密度脂蛋白胆固醇和尿素-N的含量低于饲喂CON和CTC日粮的肉鸡。建议以1,000 mg / kg的水平提供CWE，以改善抗氧化剂状态，胆固醇代谢和生长性能，同时不影响肉鸡的正常肉品质。05）提供CWE日粮的肉鸡比饲喂CON和CTC日粮的肉鸡高。建议以1,000 mg / kg的水平提供CWE，以改善抗氧化剂状态，胆固醇代谢和生长性能，同时不影响肉鸡的正常肉品质。05）提供CWE日粮的肉鸡比饲喂CON和CTC日粮的肉鸡高。建议以1,000 mg / kg的水平提供CWE，以改善抗氧化剂状态，胆固醇代谢和生长性能，同时不影响肉鸡的正常肉品质。