本试验通过在基础饲粮中添加不同植物精油产品，旨在研究其对肉仔鸡生长性能、肠道发育、免疫器官指数及屠宰性能的影响。选取1日龄罗斯308商品肉仔鸡公雏2 304只，随机分为6个组，每个组12个重复，每个重复32只。1组为对照组，饲喂基础饲粮；2组为负对照组，在基础饲粮中添加抗生素（20 mg/kg维吉尼亚霉素）；3~6组在基础饲粮中各添加1种植物精油产品，分别为100 mg/kg植物精油1（含5%香芹酚，EO1组）、300 mg/kg植物精油2（含5%香芹酚，EO2组）、300 mg/kg植物精油3（含8%香芹酚和百里香酚混合物，EO3组）以及300 mg/kg植物精油4（含2%香芹酚和百里香酚混合物，EO4组）。试验期39 d。结果表明：1）与对照组相比，负对照组以及EO2组肉仔鸡22~31日龄料重比显著降低（P<0.05），分别降低了2.58%、3.51%；与对照组相比，负对照组肉仔鸡1~38日龄平均日增重升高，料重比降低，但差异均不显著（P>0.05）；饲粮中添加不同植物精油未显著影响肉仔鸡1~38日龄平均日增重、平均日采食量和料重比（P>0.05）。2）与对照组相比，饲粮中添加不同植物精油有提高肉仔鸡39日龄十二指肠绒毛高度的趋势（P=0.075 3），绒毛高度/隐窝深度值也有所提高（P>0.05）。3）各组之间肉仔鸡22和39日龄脾脏指数和法氏囊指数均差异不显著（P>0.05）。各组之间肉仔鸡胴体出成率、胸肌率、腿肌率、翅重率以及腹脂率均差异不显著（P>0.05）。由此可见，本试验条件下，饲粮中添加不同植物精油对肉仔鸡生长性能的改善不显著，但可促进十二指肠绒毛发育。

This experiment was to study the effects of dietary different plant essential oils on growth performance, intestinal development, immune organ indexes and slaughter performance of broilers. A total of 2 304 one-day-old Ross 308 male broiler chickens were randomly divided into 6 groups with 12 replicates per group and 32 birds per replicate. Chickens in group 1 (control group) were fed a basal diet; chickens in group 2 (negative control group) were fed the basal diet supplemented with antibiotic (20 mg/kg virginiamycinin); and the others in the groups 3 to 6 were fed the basal diet supplemented with 4 kinds of plant essential oils, including 100 mg/kg plant essential oils 1 (contained 0.5% carvacrol, EO1 group), 300 mg/kg plant essential oils 2 (contained 0.5% carvacrol, EO2 group), 300 mg/kg plant essential oils 3 (contained 8% carvacrol and thymol mixture, EO3 group) and 300 mg/kg plant essential oils 4 (contained 2% carvacrol and thymol mixture, EO4 group), respectively. The experiment lasted for 39 days. The results showed as follows:1) compared with the control group, the ratio of feed to gain (F/G) of broilers at 22 to 31 days of age in negative control group and EO2 group was significantly decreased (P<0.05), which was decreased by 2.58% and 3.51%, respectively. Compared with the control group, the average daily gain (ADG) of broilers at 1 to 38 days of age in negative control group was increased (P>0.05), and the F/G was decreased (P>0.05). Dietary different plant essential oils had no significant effects on average daily feed intake, ADG and F/G of broilers at 1 to 38 days of age (P>0.05). 2) Compared with the control group, dietary different plant essential oils tended to increase the duodenum villi height of broilers at 39 days of age (P=0.075 3), and the value of villi height to crypt length ratio was increased (P>0.05). 3) There were no significant differences in spleen index and bursa of Fabricius index of broilers at 22 and 39 days of age among all groups (P>0.05). Moreover, there were no significant differences in carcass yield, breast yield, thigh yield, wing yield and abdominal fat yield of broilers among all groups (P>0.05). It is concluded that under this experimental condition, dietay plant essential oil has no effect on growth performance of broilers, but it is beneficial to duodenum villi development.