The present study evaluated the feed additive containing essential oils of thyme and star anise from 1 to 42 D of age on growth performance, physiological parameters, carcass traits, intestinal bacterial community, antioxidant status of meat, and economic efficiency in broilers under Egyptian weather condition. Two hundred and seventy 1-day-old Indian River broiler chicks were randomly distributed in three groups and fed a basal diet for 42 D. The control (Co) group, T1 group, and T2 group were fed 0.0 mg/kg diet, 150 mg/kg diet, and 300 mg/kg diet, respectively. The highest final weight and weight gain were recorded by the T2 and T1 groups compared to the control group (P < 0.05). The feed intake was not affected by any of the treatments. Improvements in feed conversion ratio and mortality of chickens were recorded by the T2 group. Blood serum parameters were significantly affected by dietary treatments but remained within the normal range. Carcass characteristics were insignificantly different among groups. The scavenging activity of 1,1-diphenyl-2-picrylhydrazyl free radical was significantly increased in the T2 group compared to the control group. The total bacterial counts, including Lactobacillus, were not affected significantly among groups. However, The Enterococcus counts were significantly higher (P < 0.05) in T1 and T2 groups. European production efficiency factor was increased in T1 and T2 groups compared to the control group. This implied that the addition of essential oils of thyme and star anise had a positive effect on growth performance of broiler chickens.

本研究评估了埃及天气条件下1至42 D年龄的百里香和八角茴香精油的饲料添加剂的生长性能，生理参数，car体性状，肠道细菌群落，肉的抗氧化状态以及肉鸡的经济效率。将270只1日龄的印度河肉鸡随机分为3组，饲喂基础日粮42 D。对照（Co）组，T1组和T2组饲喂0.0 mg / kg日粮，150只毫克/公斤饮食和300毫克/公斤饮食。与对照组相比，T2和T1组记录的最高最终体重和体重增加（P < 0.05）。采食量不受任何处理的影响。T2组记录了饲料转化率和鸡死亡率的提高。饮食治疗会显着影响血清参数，但仍在正常范围内。groups体特征在各组之间差异不明显。与对照组相比，在T2组中1，1-二苯基-2-吡啶并肼基自由基的清除活性显着增加。各组之间的细菌总数（包括乳杆菌）均未受到明显影响。但是，肠球菌计数明显更高（P <0.05）在T1和T2组中。与对照组相比，T1和T2组的欧洲生产效率因子有所提高。这意味着添加百里香和八角茴香精油对肉鸡的生长性能有积极的影响。