复合天然植物添加剂对黄羽肉鸡生长性能、免疫功能及脏器组织形态结构的影响

为研究复合天然植物添加剂对黄羽肉鸡生长性能、免疫功能及脏器组织形态结构的影响，试验选用400羽黄羽肉鸡混合雏，随机分为4组，对照组饲喂基础日粮，试验A、B、C组分别在基础日粮中添加低（3 g/kg）、中（5 g/kg）、高（8 g/kg）剂量的天然植物添加剂，每组10个重复，每个重复10羽，试验期50 d。结果表明，试验C组效果最佳，试验全期平均日增重较对照组提高5.53%（P<0.05），料重比较对照组降低6.11%（P<0.05），成活率比对照组提高2.16%（P<0.05）；与对照组相比，各添加剂组均在一定程度促进免疫器官发育，试验C组各免疫器官指数均显著提高（P<0.05），同时各试验组均能提高NDV疫苗抗体水平及其整齐度；各试验组显著增加了十二指肠绒毛长度和V/N值（P<0.05），并且促进肝脏、肾脏组织健康发育。本试验添加天然植物添加剂可显著提高黄羽肉鸡生长性能，增强机体免疫功能，促进肠道、肝脏和肾脏的发育，提高机体健康水平，其添加量以5 g/kg为宜。

Effects of Compounded Plant Feed Additives on the Growth Performance,Immune Function and Morphology of Internal Organs and Tissues in Yellow-feathered Broilers

The present study was aimed to study the effects of plant additives on growth performance, immune function and morphology of internal organs and tissues in Yellow-feathered broilers. 400 Yellow-feathered broilers at 10-day-old were divided into 4 groups. The broilers in control group were fed with basal diets, while in experimental group A,B and C were fed with basal diets added 3,5 and 8 g/kg plant additives, respectively. Each group had 10 replicates (10 birds per replicates), and the experiment lasted for 50 d. The results showed that group C got the best experimental results of all groups:ADG increased by 5.53% (P<0.05), F/G was decreased by 6.11% (P<0.05), the survival rate was increased by 2.16%(P<0.05), and immune organ index, duodenal villous length and serum antibody titer were significantly increased (P<0.05) compared with the control group. All the experimental groups supplemented with the plant additives could enhance development of the duodenum, liver and kidney, and NDV antibody titer. In conclusion, adding the plant additives in the diet could improve the growth performance, immune function and development of internal organs in Yellow-feathered broilers, and the recommended amount was 5 g/kg.