鸭瘟病毒的PCR检测及其产物分析   总被引：6，自引：0，他引：6  

陈建君  张毓金  杨增岐  宋长绪 《动物医学进展》2003,24(5):71-73

根据基因库中已有的鸭瘟 Ul6的序列 ,合成一对引物 ,对 3株鸭瘟病毒进行 PCR扩增 ,均扩增出大小约 42 0 bp的特异性片段。进行测序 ,结果表明 3个毒株扩增后的片段均为 42 1bp。经重复实验后确定最佳反应条件 ,按该条件对两例临床病料进行检测 ,结果均出现大小约为 42 0 bp的特异片段。PCR产物与 L ake Andes株的相关序列比较 ,广东毒株与 L ake Andes株同源性较高  相似文献   

鸭病毒性肝炎鸭胚灭活疫苗的研究   总被引：6，自引：0，他引：6  

范文明  张菊英 《畜牧兽医学报》1993,24(4):354-358

以鸭病毒性肝炎病毒Ⅰ型ATCC毒株接种健康鸭胚,收集致死的全胚组织作制苗材料,用福尔马林灭活,以麸氨酸钠终止其作用。先后试制疫苗11批,在试验室免疫雏鸭71只,经强毒攻击后,总的保护率为90.4％。本疫苗免疫雏鸭3天后可产生较坚强的免疫力,在室温至少可保存11天,在4℃可保存254天。经在江苏、安徽、广东等省推广应用200000头剂,均安全有效,颇受用户欢迎,对控制鸭病毒性肝炎的流行起了重要作用。  相似文献   

Non-target toxicology of a new mosquito larvicide, trypsin modulating oostatic factor     

Deborah M. Thompson  Frank W. Edens  Gerald A. LeBlanc  R. Michael Roe 《Pesticide biochemistry and physiology》2004,80(3):131-142

Trypsin modulating oostatic factor (TMOF), a peptide hormone originally isolated from the ovaries of adult Aedes aegypti, is currently under commercial development as a new pesticide chemistry with a novel mode of action for the control of larval mosquitoes. The objective of the current research is to evaluate potential risks of the use of TMOF as an insecticide on non-target organisms. TMOF (YDPAP₆) was degraded in vitro (as determined by HPLC and LC/MS) to DPAP₆, PAP₆, and then AP₆ by leucine aminopeptidase, a pancreatic enzyme found in the digestive system of vertebrates. The rate of degradation of TMOF and PAP₆ was significantly greater than that of DPAP₆, while no metabolism of AP₆ was found. TMOF technical insecticide was produced on a commercial scale by recombinant yeast (heat-killed before application). The technical TMOF when administered in a single dose by gavage to male and female mice at 2000 mg dry weight/kg body weight produced no negative effects as compared to controls up to 12 days after treatment. When male and female mallard ducks were treated by gavage with 1250 mg dry weight of technical TMOF/kg body weight each day for 5 days, again no toxic effects were noted through 35 days after the last treatment. TMOF technical insecticide was also applied to the shaved skin of male and female rabbits at the rate of 2000 mg/kg for 1-2 days, with no effect. The end point observations in these in vivo experiments were mortality; changes in growth rate, behavior, body structure, and color; and possible lesions observed during necropsy. Finally, Daphnia incubated with technical TMOF in rearing water at the level of 1.0 × 10⁶ yeast cells/ml (10 mg/ml) also demonstrated no negative effects on mortality, growth, molting, time to first brood, and production of viable neonates. It appears from these studies that TMOF can be degraded by vertebrate digestive proteases and technical TMOF is not toxic to the non-target organisms examined.  相似文献   

重庆市近郊区县鸭传染性浆膜炎病病原分离鉴定及防治     

柯楠 《畜牧市场》2005,(8):152-154

通过对重庆近郊的沙坪坝区、北碚区、九龙坡区、永川市、璧山县、铜梁县的7个养鸭场病死鸭的病原分离,分离到三株细菌,经染色镜检、生化鉴定、动物回归实验,确诊为鸭里氏杆菌。药敏试验结果显示对庆大霉素、青霉素、链霉素、土霉素等高度敏感。在临床上交替使用这些药物,收到较好治疗效果。将分离菌制成灭活苗免疫1周龄的健康鸭,20日龄时用分离菌进行攻毒,平均保护率达83.3%。  相似文献   

鸭流感病毒4/2004-H6N2亚型毒株的血凝素基因全序列克隆与分析     

顾节清 陈杰李晓成  杨增岐吴发兴张燕霞  黄保续 《中国动物检疫》2005,22(5):31-33

2004初从正常鸭群中分离到一株鸭源禽流感病毒，命名为A／Duck／HN／4／2004(H6N2)。经对血凝素基因(HA)序列分析发现HA基因全长为1744bp，共编码566个氨基酸，在裂解位点仅含一个碱性氨基酸-精氨酸(R)，符合LPAIV的标准。将所得基因序列与已发表的同一亚型参考序列分析表明，与H6亚型流感HA基因同源性为89．2％-97．1％，经分子遗传演化分析表明本次分离株与香港分离株A／Duck／Hong Kong／3600／99(H6N2)、A／Duck／Hong Kong／3600／99(H6N2)最近。  相似文献   

中药复方治疗感染DHBV麻鸭的研究     

吴燕  王金兵 《中国预防兽医学报》1999,21(5):368-370

本研究以人工感染鸭乙型肝炎病毒（ Ｄ Ｈ Ｂ Ｖ）的麻鸭为实验模型，用两组中药复方进行体内抗病毒实验研究。结果表明：１实验结束时，两个治疗组麻鸭的平均体重增长值显著高于对照组（ Ｐ＜ ０００１），而平均肝重显著低于对照组（ Ｐ＜ ０００１），肝系数也显著小于对照组（ Ｐ＜ ０００１）；２两个治疗组麻鸭随着服药时间的延长， Ｄ Ｈ Ｂ Ｖ 转阴率持续增加，实验结束时转阴率均分别显著高于对照组（２９２７％ 与３０５６％ ８１１％ ， Ｐ＜ ００５）；而且未出现 Ｄ Ｈ Ｂ Ｖ 转阴后又转阳现象。提示这两组中药复方不仅具有抗病毒的作用，而且药物安全、药效稳定，且有较好的治疗效果；建议试用于临床治疗乙型肝炎。  相似文献   

肉鸭实验性锰缺乏症及高磷对缺锰影响的病理学研究     

蔡红  冯泽光 《畜牧兽医学报》1997,28(4):342-348

６９只一日龄天府肉鸭随机分为三组，各喂以基础、高磷、对照。试验分为两个阶段，第一阶（０－４周）结束时，每组各留２只鸭继续进行第二阶段（５－２０或２６周）试验。缺锰组第一周开始发病，第二周迅速达到高峰。  相似文献   

北京鸭传染性窦炎的调查研究——Ⅰ.流行病学调查与病理学研究     

田克恭  郭玉璞 《畜牧兽医学报》1990,(4)

1983年以来,北京地区几个商品鸭场陆续发生鸭窦炎。一年四季均可发生,冬春季多发。7～15日龄雏鸭易感性最高,发病率高,死亡率低。病鸭主要表现沉郁,打喷嚏,摇头,窦炎和结膜炎。耐过鸭生长缓慢,出栏期延长。病理剖检以呼吸器官尤其是眶下窦的炎性反应为特征。组织学变化主要表现呼吸道粘膜充血、水肿、出血,大量单核细胞、淋巴细胞浸润以及淋巴滤泡反应。  相似文献   

肉鸭3～7周龄预混料及全价饲料优化配方研究     

李焕友  姚武群  田萍  张云琦  朱锦兰  胡文娥  黄德纯  潘杏荷 《畜禽业》2001,(3):22-24

本研究在“肉鸭3～7周龄基础日粮优化配方研究”的基础上，将筛选出的肉鸭3～7周龄2套基础日粮优化配方与3套不同类型的预混料配方进行组合，进行饲养试验与屠宰测定，观察肉鸭的生长速度、饲料报酬、成活率、单位增重饲料成本、屠体品质等性状。结果显示：本试验设计的预混料配方Ⅲ是肉鸭3～7周龄预混料优化配方，优化基础配方Ⅰ与预混料配方Ⅲ、Ⅱ的组合均为肉鸭3～7周龄全价饲料优化配方。  相似文献   

Molecular cloning and functional analysis of duck Toll-like receptor 5     

Dan Xiong  Zhiming Pan  Xilong Kang  Jing Wang  Li Song  Xinan Jiao 《Research in veterinary science》2014

Toll-like receptor 5 (TLR5) is responsible for the recognition of bacterial flagellin in vertebrates. In this study, we cloned the single-exon TLR5 gene of the Maya breed of Common Shelduck (Tadorna tadorna). The TLR5 open reading frame is 2580 bp in length and encodes an 859-amino acid protein. The putative amino acid sequence of duck TLR5 consisted of a signal peptide sequence, 11 leucine-rich repeat domains, a leucine-rich repeat C-terminal domain, a transmembrane domain, and an intracellular Toll-interleukin-1 receptor domain. The duck TLR5 gene was highly expressed in the lung, bone marrow, spleen, and liver; moderately expressed in kidney, small intestine, large intestine, and brain. A plasmid expressing duck TLR5 was constructed and transfected into HEK293T cells, and expression was confirmed by indirect immunofluorescence assay. HEK293T cells transfected with duck TLR5- and NF-κB-luciferase-containing plasmids significantly responded to flagellin from Salmonella typhimurium, indicating that it is a functional TLR5 homolog.  相似文献