中药复方板青可溶性粉防治鸡传染性支气管炎的效果研究

为研究复方板青可溶性粉防治传染性支气管炎病毒感染雏鸡的功效与影响，本试验将鸡随机分为预防组、治疗组、双黄连治疗对照组、麻杏石甘治疗对照组、模型对照组和空白对照组。其中预防组和治疗组分别设高、中、低剂量组。除空白对照组不做处理外，预防组从12日龄起连续3 d通过饮水给药，随后各处理组将0.2 mL/只剂量的传染性支气管炎病毒通过滴鼻使15日龄的雏鸡染毒，染毒后治疗组连续6 d饮水给药。试验期间统计鸡发病数和治愈数，计算其发病率、保护率和治愈率；并检测各组鸡只的免疫器官指数、淋巴细胞增殖能力、血清中细胞因子IL-2、IL-4、TNF-α和IFN-α水平，探究复方板青可溶性粉对IBV感染雏鸡的防治效果。试验结果显示，复方板青可溶性粉预防高剂量组保护率可达66.67%，治疗中剂量组治愈率可达83.33%，另一方面提高了感染雏鸡的免疫器官指数，增强了淋巴细胞增殖能力，在染毒后4和10 d，各给药组的T淋巴细胞和B淋巴细胞增殖能力显著高于模型对照组（P<0.05）；还可以调节血清中IL-2、IL-4、TNF-α和IFN-α水平，使其维持动态平衡，其中在攻毒后5和11 d，治疗中剂量组的IL-4和IFN-α水平显著高于模型对照组（P<0.05）。综合试验数据，复方板青可溶性粉具有较好的预防和治疗传染性支气管炎的作用，且治疗作用优于预防作用，其中预防高剂量组及治疗中剂量组效果最为显著。

Study on the Preventive and Therapeutic Effect of Compound Banqing Soluble Powder on Chicken Infectious Bronchitis

The purpose of this study was to study the efficacy and effect of compound Banqing soluble powder in preventing and treating chickens infected with infectious bronchitis virus.The chickens were randomly divided into prevention group,treatment group,Shuanghuanglian control group,Maxing Shigan control group,model control group and blank control group.Among them,the prevention group and the treatment group were divided into high,middle and low dose groups respectively.Except for the blank control group,the prevention group was given drugs through drinking water for 3 consecutive days from 12 days old,and then the 15-day-old chicks were exposed to 0.2 mL infectious bronchitis virus by nasal drip,and the treatment group was given drinking water for 6 days.The number of infected and cured chickens were collected during the experiment,the incidence,protection rate and cure rate were calculated,and the index of immune organs,the ability of lymphocyte proliferation and the levels of cytokines IL-2,IL-4,TNF-α and IFN-α in serum were detected to explore the preventive and therapeutic effect of compound Banqing soluble powder on IBV infected chicks.The results of this experiment showed that the protective rate of compound banqing soluble powder against high dose group could reach 66.67%,and the cure rate of the treatment middle dose group was 83.33%.On the other hand,it increased the immune organ index of infected chicks,after exposure 4 and 10 d,the proliferative capacity of T lymphocytes and B lymphocytes in each administration group was significantly higher than that of the model control group (P<0.05).It could also regulate the levels of IL-2,IL-4,TNF-α and IFN-α in serum to maintain dynamic balance,after the challenge (5 and 11 d),the middle-dose group of IL-4 and IFN-α levels were significantly higher than the model control group (P<0.05).Synthesizing the test data,compound Banqing soluble powder had a good effect on the prevention and treatment of infectious bronchitis,and the therapeutic effect was better than the preventive effect.Among them,the preventive high dose group and the middle dose group were the most effective.