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文章旨在研究丁酸梭菌对肉鸡生长性能和体液免疫应答能力的影响,试验将90只1日龄麻黄鸡苗随机分成3组,每组3个重复,每个重复10只,所有鸡于第1和21日龄分别用同种疫苗同样方式进行二次免疫。对照组饲喂基础日粮,丁酸梭菌低剂量组在基础日粮中添加2×105CFU/g丁酸梭菌,高剂量组在基础日粮中添加5×105CFU/g丁酸梭菌,定期测量免疫器官指数、肠道指数、平均日增重、饲料转化率、新城疫抗体效价和禽流感抗体效价。结果表明,对42日龄内的肉鸡,丁酸梭菌高剂量组肉鸡的肠道指数、日增重和饲料转化率略高于对照组(P> 0.05);对42日龄以上的肉鸡,丁酸梭菌高剂量组的日增重和饲料转化率显著高于对照组(P <0.05),但与丁酸梭菌低剂量组相比无显著差异,而丁酸梭菌低剂量组鸡的饲料转化率和禽流感抗体效价最高值显著高于对照组(P <0.05),丁酸梭菌高剂量组鸡的新城疫和禽流感抗体效价低于对照组(P> 0.05)。综合考虑,在肉鸡饲料中添加2×105CFU/g的丁酸梭菌可以改善肠道指数,提高日增重和饲料转化率,... 相似文献
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《中国兽医杂志》2016,(9)
为了研究全反式维甲酸(ATRA)对新城疫疫苗的体液免疫增强效果,本试验选取1日龄AA肉鸡作为研究对象,低剂量组和高剂量组分别灌服1μmol/kg体重和5μmol/kg体重ATRA,在7日龄和28日龄时对药物对照组、低剂量组、高剂量组通过滴鼻、点眼的方法免疫新城疫疫苗。在7、14、21、28、35、42日龄和49日龄,每组随机取7只鸡,称重,采集胸腺、脾脏、腔上囊和血清,计算胸腺、脾脏和腔上囊免疫器官指数,利用血凝抑制(HI)试验检测血清中新城疫抗体效价。结果表明,ATRA可以促进雏鸡免疫器官生长,提高雏鸡免疫器官指数和新城疫抗体效价,表明ATRA可以增强雏鸡的体液免疫应答,且5μg/kg体重剂量ATRA对新城疫疫苗的体液免疫增强效果更显著。 相似文献
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多肽菌素对肉鸡血清生化指标、血清抗体水平及免疫器官指数的影响 总被引：1，自引：0，他引：1
试验旨在研究多肽菌素对肉鸡血清生化指标、血清抗体水平及免疫器官指数的影响,以验证多肽菌素提高肉鸡机体免疫力的能力。4万只1日龄科宝500肉雏鸡随机分为2组,即试验组和对照组,每组4个重复,每个重复5 000只。对照组按原有免疫和用药程序7日龄、14日龄及21日龄均进行新城疫和禽流感疫苗免疫;试验组鸡只在7日龄时进行新城疫和禽流感疫苗免疫,并在13~15日龄饲喂添加多肽菌素(400 g/t)的日粮,20~22日龄饲喂添加多肽菌素(300 g/t)的日粮。试验期28 d。结果显示:试验组28日龄肉鸡血清总蛋白含量、球蛋白含量、球蛋白与白蛋白比值(球/白)分别比对照组提高10.75%、15.17%、11.45%,谷草转氨酶活性比对照组提高6.23%,差异显著(P0.05);试验组肉鸡新城疫病毒抗体效价比对照组提高19.89%,差异显著(P0.05),禽流感病毒抗体效价比对照组提高6.97%,差异显著(P0.05);试验组肉鸡脾脏指数比对照组提高17.05%,差异显著(P0.05),试验组胸腺指数比对照组提高11.89%,差异显著(P0.05)。研究表明:肉鸡日粮添加多肽菌素,可以显著改善血清生化指标,提高机体抗体水平及免疫器官指数。 相似文献
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研究中药复方"健脾消食散"添加剂对雏鸡免疫功能影响。将200只健康、14日龄和体质量接近的兰灰祖代蛋雏鸡随机分为空白对照组、低剂量组、中剂量组和高剂量组,每组50只鸡。于21日龄对4组雏鸡用新城疫Ⅳ系弱毒疫苗进行滴鼻点眼免疫,分别按照饲喂量的0.5%、1.0%和1.5%添加健脾消食散,连续7 d,试验周期为49 d。分别于21、28、35、42和49日龄时,每组随机各取10只鸡进行白细胞总数、血清抗体效价、免疫器官指数(脾和法氏囊)测定。结果表明:中药复方"健脾消食散"添加剂高、中和低剂量均能显著促进血液中白细胞总数的增加和血液HI抗体产生,显著增加肉鸡法氏囊和脾免疫器官指数,促进免疫器官的发育。在雏鸡免疫后35日龄时白细胞总数、脾指数和鸡法氏囊指数达到最高峰值,42日龄时,雏鸡血液HI抗体水平达到最高水平;42日龄后各组雏鸡白细胞数量均呈下降趋势,49日龄与42日龄相比,各组雏鸡血液HI抗体水平均呈下降趋势,且与对照组间存在显著差异;中和高剂量组雏鸡28～49日龄时脾指数和鸡法氏囊指数差异不显著。中药复方"健脾消食散"添加剂高、中和低剂量均能够提高雏鸡的免疫力,添加中剂量"健脾消食散"能达到增加雏鸡免疫力的目的。 相似文献
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试验旨在研究肉鸡日粮中添加枯草芽孢杆菌B7对其生长性能及免疫功能的影响。将200只1日龄健康爱拔益加肉雏鸡随机分成5组,每组4个重复,每个重复10只。对照组饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组分别在基础日粮中添加2×105、5×105、8×105和1×106 CFU/g枯草芽孢杆菌B7。试验期42 d。结果表明:①在整个试验阶段,除29～35日龄外,试验Ⅱ组肉鸡的日增重均高于对照组,料重比均低于对照组;36～42日龄时,与对照组相比,试验Ⅱ组肉鸡的日增重显著提高了10.25%(P<0.05),料重比显著降低了14.83%(P<0.05)。②28日龄时,试验Ⅱ组脾脏指数高于对照组31.96%,差异显著(P<0.05);除14和28日龄外,试验Ⅱ组法氏囊指数均显著高于对照组(P<0.05);试验Ⅱ组新城疫抗体效价处于较高水平,28和35日龄时,试验Ⅱ组新城疫抗体效价分别高于对照组16.04%和18.09%,差异显著(P<0.05);21、35和42日龄时,试验Ⅱ组血清中IgG含量分别高于对照组81.94%、46.67%和15.63%,差异显著(P<0.05)。由此可知,添加5×105 CFU/g枯草芽孢杆菌B7能够提高肉鸡的生长性能,增强肉鸡的免疫功能,综合比较,试验Ⅱ组的5×105 CFU/g为枯草芽孢杆菌B7的最佳添加量。 相似文献
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为了探讨五味健脾合剂对肉鸡前期生产性能和新城疫抗体效价的影响,试验将肉雏鸡随机分成5组,药物对照(0.05%黄芪多糖口服液)组、五味健脾合剂高剂量(0.4%)组、五味健脾合剂中剂量(0.2%)组、五味健脾合剂低剂量(0.1%)组和空白对照(给予饮用水)组。在试验过程中,分别于7,21日龄使用新城疫疫苗免疫试验鸡群,在雏鸡1,7,21日龄记录各组雏鸡体重和采食量,并于7,21,35日龄检测新城疫抗体效价,计算7,21日龄各组雏鸡平均增重、料重比和7,21,35日龄新城疫抗体效价。结果表明:五味健脾合剂高剂量组对提升肉鸡平均增重和降低料重比的效果最优,显著优于空白对照组(P0.05);同时五味健脾合剂高剂量组雏鸡在21,35日龄时新城疫抗体效价也有一定提高,但与药物对照组和空白对照组相比均差异不显著(P0.05)。说明在肉鸡养殖中使用五味健脾合剂对肉鸡生产性能和新城疫抗体效价的提高具有促进作用。 相似文献
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试验旨在研究复合微生态制剂对黄羽肉鸡生长性能和疫苗免疫效果的影响。将150只1日龄黄羽肉鸡[（34.5±1.5）g]随机分成对照组和4个试验组,全部接种禽流感-新城疫二联灭活疫苗,对照组饲喂基础日粮,试验组在基础日粮中分别添加2×105CFU/g丁酸梭菌、0.4%低聚果糖、107CFU/g酿酒酵母等不同组合的微生态制剂,定期测定生长性能指标和禽流感、新城疫抗体效价。结果显示：84日龄时,试验Ⅲ组胃肠道指数显著低于对照组（P<0.05）。对于22～42日龄段幼龄黄羽肉鸡,与对照组比较,试验Ⅱ组平均日增重显著提高（P<0.05）、料重比显著降低（P<0.05）,试验Ⅲ组平均日增重显著降低（P<0.05）。对42日龄以上青年黄羽肉鸡,与对照组比较,试验Ⅰ组和Ⅲ组平均日增重显著提高（P<0.05）、料重比显著降低（P<0.05）,试验Ⅳ组平均日采食量和料重比显著降低（P<0.05）,而试验Ⅱ组无明显影响;与对照组比较,试验Ⅰ、Ⅱ、Ⅲ组提高了禽流感抗体效价峰值和抗体保持时间,试验组对新城疫抗体效价无显著影响。综合考虑：在幼龄黄羽肉鸡的日粮中添加合适剂量的... 相似文献
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《中国饲料》2017,(4)
本试验旨在研究复合益生菌对肉鸡生产性能、屠体性能及养分表观利用率的影响。试验选取300只1日龄的AA肉鸡商品代雏鸡,采用单因子随机分组试验设计将其分为5个处理组,每个处理组3个重复,每个重复20只鸡。其中,Ⅰ组为对照组,饲喂基础饲粮,正常饮水;Ⅱ组为抗生素组,饲喂基础饲粮,在饮水中添加恩诺沙星和硫酸黏菌素;Ⅲ组饲喂基础饲粮,在饮水中添加5×105 cfu/m L海洋红酵母BSH、1×107 cfu/g枯草芽孢杆菌和1×106 cfu/g乳酸菌;Ⅳ组饲喂基础饲粮,在饮水中添加1×106 cfu/m L海洋红酵母BSH、2×107 cfu/g枯草芽孢杆菌和2×106 cfu/g乳酸菌;Ⅴ组饲喂基础饲粮,在饮水中添加1.5×106 cfu/m L海洋红酵母BSH、3×107 cfu/g枯草芽孢杆菌和3×106 cfu/g乳酸菌。试验期为42 d。结果表明:与Ⅰ组相比,添加不同浓度的复合益生菌,肉鸡1~21 d和22~42 d的日增重和日采食量均显著增加(P0.05),与Ⅱ组基本保持一致;与Ⅰ组和Ⅱ组相比,42 d的屠宰率、胸肌率、腿肌率有一定程度改善(P0.05),腹脂率显著降低(P0.05);与Ⅰ组相比,21 d和42 d能量、干物质、粗蛋白质和粗脂肪的养分表观利用率显著提高(P0.05),与Ⅱ组基本保持一致(P0.05)。结果提示,添加不同浓度的复合益生菌能够提高肉鸡的生产性能、屠体性能和养分表观利用率,在规模化肉鸡饲养中用复合益生菌部分替代饲用抗生素是可行的,其中以浓度为1.5×106cfu/m L海洋红酵母BSH、3×107 cfu/g枯草芽孢杆菌和3×106 cfu/g乳酸菌的复合益生菌的效果最好。 相似文献
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《中国兽医杂志》2016,(7)
为考察复方中药混菌发酵制剂对AA肉鸡免疫功能的影响,试验选取健康AA肉鸡400只,随机分成5组,每组设5个重复。试验鸡在新城疫活疫苗(La Sota株)免疫时分别应用复方中药制剂和复方中药混菌发酵制剂连用7 d,并于14、28日龄分别进行白细胞、淋巴细胞计数和测定T-淋巴细胞阳性率、免疫器官指数及新城疫抗体效价等免疫指标。结果与空白对照组相比,复方中药混菌发酵制剂可显著或极显著提高鸡的白细胞、淋巴细胞数量,T-淋巴细胞阳性率、免疫器官指数和新城疫抗体水平(P0.05或P0.01);与药物对照组相比,复方中药混菌发酵制剂中、高剂量组可显著提高淋巴细胞数量、免疫器官指数和新城疫抗体水平(P0.05),复方中药混菌发酵制剂用药剂量可以减半使用。表明复方中药混菌发酵制剂能显著地促进肉鸡淋巴细胞的增殖、免疫器官发育和疫苗抗体的产生,增强机体的免疫功能。 相似文献
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《畜牧与生物技术杂志(英文版)》2015,(3)
Background:As a member of the Paramyxoviridae group,Newcastle disease virus(NDV) is the key causative agent of Newcastle disease(ND) that attacks chickens,turkeys and other avian birds.Surviving birds showed lower feed utilization,growth performance or egg production,which results in severe economic losses.The purpose of this study was to determine the effect of different doses of NDV immunization on growth performance,plasma variables and immune response of broiler chickens.Methods:A total of 480 one-day-old Arbor Acres broilers were randomly administrated with 0,4,6 or 8 doses of NDV at 12 d and 28 d,respectively.Each group consisted often replicates with 12 birds each.Growth performance and organ weight were recorded.Plasma concentration of glucose,total protein,cholesterol,triglycerides and nonesterified fatty acid was determined using commercial kits.The concentration of plasma corticosterone and insulin was measured using commercially available radio immune assay kits.Serum antibody titer and peripheral blood lymphocyte proliferation were also recorded.Results:The results showed that NDV decreased body weight gain(BWG),and increased Feed:Gain ratio at 1-21 d at all doses(P 0.05).Plasma insulin concentration was lower in all immunization groups after the first immunization at12 d(P 0.01).The rest of the plasma indexes were not affected by NDV immunization,including glucose,total protein,cholesterol,triglycerides,nonesterified fatty acid,heterophil/lymphocyte ratio,as well as the proliferation of peripheral blood lymphocyte(P 0.05).Compared with the control group,NDV treatment elevated NDV antibody titer at 10 d after the first inoculation(P 0.05),and at d 5,9 and 13 after the second inoculation(P 0.05).Repeated NDV inoculation had no deleterious impacts on body composition at 42 d,and nutrient accretion rates at 8-42 d(P0.05).Conclusions:In conclusion,NDV challenge decreased BWG and feed efficiency in earlier stage of growth.However,NDV treatment at 6 doses down-regulated the Feed:Gain ratio by 6.36%throughout the whole growing period.These data suggest that appropriate lower doses of NDV inoculation increase feed efficiency of broiler chickens. 相似文献
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研究旨在探讨日粮中添加芽孢杆菌制剂对黄羽肉鸡生长性能及养分利用率的影响。将375羽黄羽肉鸡随机分成5组,每组3个重复,每个重复25只鸡,试验Ⅰ组饲喂基础日粮,试验Ⅱ～Ⅴ组分别在基础日粮中添加150g/t、200g/t、250g/t和300g/t芽孢杆菌制剂,试验分为7～28日龄和29～56日龄两个阶段,共49d。结果显示：与对照组相比,试验Ⅴ组肉鸡料重比降低8.52%,差异显著（P〈0.05）;其粗蛋白表观代谢率为80.77%,比试验Ⅰ～Ⅳ组分别高了9.50%（P〈0.01）、4.00%（P〈0.05）、2.51%（P〉0.05）和2.40%（P〉0.05）,对干物质和表观代谢能无显著影响（P〉0.05）;日粮添加300g/t的芽孢杆菌制剂还可显著提高天冬氨酸、苏氨酸、丙氨酸、胱氨酸、缬氨酸、蛋氨酸和脯氨酸的表观代谢率（P〈0.05）。结果表明,日粮中添加芽孢杆菌制剂可提高黄羽肉鸡生长性能、粗蛋白和氨基酸的利用率,且以添加300g/t为最佳。 相似文献
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枯草芽孢杆菌对黄羽肉鸡生长性能及营养物质代谢率的影响 总被引：2，自引：2，他引：0
试验旨在研究枯草芽孢杆菌对黄羽肉鸡生长性能及营养物质代谢率的影响,为枯草芽孢杆菌制剂在黄羽肉鸡生产中的应用提供理论依据。选择60羽7周龄体重相近、健康的黄羽肉鸡,随机分成5组,每组设4个重复,每重复3羽,设一个对照组,饲喂基础日粮;试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组分别在基础日粮中添加0.05、0.1、0.15、0.2 g/kg的枯草芽孢杆菌制剂(活菌数为108 CFU/g)。试验期30 d。结果表明,与对照组相比,试验Ⅱ、Ⅲ、Ⅳ组日增重分别提高了49.03%(P<0.05)、46.39%(P<0.05)和37.04%(P<0.05),各试验组饲料报酬均有所提高但无显著差异;各试验组可极显著提高粗蛋白质的代谢率(P<0.01),粗脂肪、钙、磷及表观代谢能的代谢率均有提高,试验Ⅲ组极显著提高黄羽肉鸡对钙、磷的吸收利用率(P<0.01),并且,试验Ⅲ组粗蛋白质、粗脂肪的代谢率最高。因此,在黄羽肉鸡日粮中枯草芽孢杆菌制剂适宜的添加量为0.15 g/kg。 相似文献
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试验旨在探讨饲喂或鸡舍喷洒复合芽孢杆菌制剂对肉鸡福利状况的影响。选取健康、体重相近的1日龄AA肉鸡300只,随机分在3个处理中,每个处理4个重复,每个重复25只鸡,网上平养。处理1为对照组,饲喂玉米一豆粕基础日粮;处理2为饲喂组,在基础日粮中添加复合芽孢杆菌制剂200mg／kg;处理3为喷洒组,在鸡舍空气中喷洒复合芽孢杆菌喷剂。41日龄时对各处理肉鸡的福利状况进行评估。结果表明,饲喂组和喷洒组肉鸡试验期没有出现死亡,而对照组的死亡率为3％,各组间肉鸡死亡率差异不显著（P〉0．05）;肉鸡羽毛清洁度与步态评分结果优劣次序为：喷洒组〉饲喂组〉对照组;饲喂或喷洒芽孢杆菌的肉鸡脚垫评分都优于对照组;从跗关节损伤度来看,各处理组评分结果优劣程度为：对照组优于喷洒组,喷洒组优于饲喂组。试验结果显示,在AA肉鸡日粮中添加复合芽孢杆菌制剂或在鸡舍中喷洒复合芽孢杆菌制剂可以在一定程度上改善肉鸡的福利状况。 相似文献
15.
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. 相似文献
16.
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。 相似文献
17.
将180只1日龄健康AA肉仔鸡随机分为6组,每组设3个重复,第1、2、4、6组分别以硫酸铜、氧化铜、纳米氧化铜、纳米铜的形式在基础日粮中添加铜8mg/kg,3组和5组以纳米氧化铜形式在基础日粮中分别添加铜4mg/kg和16mg/kg,研究不同剂量纳米氧化铜对肉鸡免疫功能的影响.结果表明,与硫酸铜、氧化铜组相比,在饲料中以纳米氧化铜形式添加铜8mg/kg和16mg/kg,显著提高肉鸡免疫器官指数、新城疫抗体效价、淋巴细胞转化率和白细胞介素-2(IL-2)活性,以纳米氧化铜形式添加铜4mg/kg未引起机体免疫低下.由此可见,与硫酸铜相比,日粮中添加纳米氧化铜可提高肉鸡免疫功能. 相似文献
18.
Reduced serologic response to Newcastle disease virus in broiler chickens exposed to a Chinese field strain of subgroup J avian leukosis virus 总被引：3，自引：0，他引：3
In this study, a Chinese field strain of subgroup J avian leukosis virus (ALV-J), NX0101, was studied for its immunosuppressive effects in both commercial broilers and SPF white Leghorn chickens infected at 1 day of age. Our data demonstrated that NX0101 induced much more significant body and immune organ weight loss in the infected commercial broiler chickens in an earlier age than that in the SPF white Leghorn chickens. At the same time antibody responses to vaccinations of Newcastle disease virus (NDV) and infectious bursa disease virus (IBDV) in the NX0101-infected chickens were also evaluated and compared between the commercial broiler chickens and the SPF white Leghorn chickens. Compared with the control group of chickens, the hemagglutination inhibition (HI) antibody response to NDV vaccines was significantly reduced in the NX0101-infected commercial broiler chickens from as early as 20 days after vaccination. However, no significant difference in HI antibody response was seen when HI titers reached their peaks in the NX0101-inoculated and control SPF white Leghorn chickens, except it declined significantly faster in infected birds. Neither of these two types of chickens showed significant decrease of antibody response to IBDV vaccination. Herein, we conclude that this NX0101 strain of ALV-J could selectively suppress humoral immune reactions to NDV, especially in broilers. But challenge experiments were not conducted and, therefore, it cannot be known if decreased antibody levels correlated with decreased protection against NDV in this case. 相似文献
19.
试验旨在研究天蚕素抗菌肽对817肉杂鸡生长性能和免疫功能的影响。选取1日龄817肉杂鸡900羽,随机分为5个处理组（对照组、抗生素组及Ⅰ、Ⅱ、Ⅲ组）,每组6个重复,每个重复30羽。对照组饲喂基础日粮,抗生素组在基础日粮中添加150 mg/kg金霉素,Ⅰ、Ⅱ、Ⅲ组分别在基础日粮中添加100、200和300 mg/kg天蚕素抗菌肽,试验期42 d。结果显示,Ⅱ、Ⅲ组能显著提高1~21日龄817肉杂鸡的平均日增重（P<0.05）,显著降低料重比（P<0.05）;显著提高21、42日龄817肉杂鸡的胸腺、法氏囊和脾脏指数（P<0.05）;显著提高42日龄肉杂鸡的ND抗体水平和T淋巴细胞转化率（P<0.05）,表明在日粮中添加天蚕素抗菌肽能提高817肉杂鸡的生长性能和免疫功能,在本试验条件下,适宜的添加量为200 mg/kg。 相似文献
20.
This experiment was conducted to investigate the effects of antimicrobial peptide on growth performance and immune function of 817 broiler hybrids. Nine hundred one-day-old 817 broiler hybrids were chosen and randomly divided into 5 groups with 6 replicates per group and 30 broilers per replicate.The broilers in control group were fed with basal diet, broilers in the antibiotic group were fed with basal diet supplemented 150 mg/kg aureomycin,and that in groups Ⅰ,Ⅱ and Ⅲ were fed with basal diet supplemented 100,200 and 300 mg/kg antimicrobial peptide,respectively. The experiment period was 42 days. The results showed that average daily gain of 817 broiler hybrids in groups Ⅱ and Ⅲ was significantly increased (P<0.05),meanwhile the F/G was significantly decreased at 1-21 days old (P<0.05).The immune organ indexes of thymus,bursa of Fabricius and spleen were significantly increased at 21 and 42 days old (P<0.05),and the antibody level against ND and T lymphocyte transformation rate of 42 days old 817 broiler hybrids were improved (P<0.05). It indicated that antimicrobial peptide could increased growth performance and immune function of 817 broiler hybrids as same with aureomycin,and appropriate dosage of antimicrobial peptide was 200 mg/kg in this experiment. 相似文献