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1.
本研究通过对50枚种蛋中卵白P27抗原与ALV(ALV-J、ALV-A)抗体的ELISA检测实现了对该海兰褐蛋鸡群的ALV感染状态调查。收集该鸡群的50枚鸡蛋,分别采用针对P27抗原与ALV-J、ALV-AB抗体的ELISA试验盒,取鸡蛋卵白直接检测p27抗原,取卵黄测ALV-J、ALV-AB抗体。结果显示,50枚鸡蛋卵白中p27抗原阳性率达到10%(10/50),ALV-J、ALV-AB抗体阳性率分别为12%(6/50)、20%(10/50)。本研究表明,该蛋鸡群存在外源性ALV感染。 相似文献
2.
为了检测某蛋用型父母代鸡群是否存在外源性禽白血病病毒（ALV）的感染,收集该鸡群的92枚鸡胚,每枚鸡胚无菌取蛋清2份,一份用禽白血病病毒p27抗原检测试剂盒直接检测群特异性p27抗原,同时分别将92枚鸡胚蛋清接种DF1细胞,培养维持8d后取细胞上清检测p27抗原。将p27抗原阳性样品,分别用针对ALV-J和ALV-AB的单因子血清做间接免疫荧光检测（IFA）。比较p27阳性检出率。结果表明,直接检测蛋清的检出率高于蛋清接种DF1后的细胞上清,接种DF1细胞后p27抗原阳性样品的IFA检测结果显示ALV-J的阳性率为100%,ALV-AB全部为阴性。说明该蛋用型父母代鸡群存在的外源性ALV感染主要是ALV-J,该研究为针对ALV的净化提供了可行性检测方法。 相似文献
3.
《中国预防兽医学报》2017,(3)
为了解贵州省9个地方品种鸡群中禽白血病病毒(ALV)流行株亚型与分子特征,本研究2016年从该省8个地区9个地方品种鸡群共采集380份鸡蛋样品。采集卵白用ELISA试剂盒检测ALV-P27抗原,阳性卵白接种CEF和DF1细胞分离病毒,培养7 d后检测细胞培养液中ALV-P27抗原,对感染细胞cDNA以4对ALV特异性引物进行PCR鉴定与分型。并选取9个鸡群的部分ALV分离株进行gp85基因的克隆测序与序列分析。结果表明,9个鸡群的卵白样品ALV-P27抗原阳性率为0~36%;阳性卵白的CEF和DF1细胞培养上清P27抗原检测结果相同,阳性率为26.8%(15/56),并鉴定出其亚型全部为J亚型(ALV-J)。已测序的21株ALV-J gp85基因序列与国内外ALV-J参考株同源性为86.6%~100%;进化树分析显示,21株ALV-J分离株在不同的分支,其进化关系和来源之间未发现明显规律。本研究表明,贵州省9个地方品种鸡群有6个存在ALV-J感染。其中,3个当地培育的品种鸡ALV感染率为0;而来自3个地区的绿壳蛋鸡ALV-P27抗原阳性率普遍较高(26.7%~36.0%)。本研究补充了我国禽白血病流行病学的数据并为该病的防制提供了调查依据。 相似文献
4.
本研究旨在探究用DF1细胞替代DF1细胞上清对外源性禽白血病病毒(ALV)进行快速检测.采集ALV p27抗原阳性的地方品种百日鸡的抗凝血22份,阴性鸡的抗凝血2份,离心取白细胞接种DF1细胞培养,重复9块24孔细胞培养板.每隔24 h取1块24孔板,分别收集细胞上清与DF1细胞于-20℃冻存,直至第9天,采用酶联免疫吸附试验(ELISA)检测所有细胞上清与DF1细胞中的ALV p27抗原,并采用SPSS Statistics 17.0软件比较分析细胞上清与DF1细胞中ALV p27抗原S/P值的差异性与相关性.结果显示:培养8d的细胞上清中可检测到所有的15份阳性样品,而培养4d即可在DF1细胞中检出所有阳性样品(15份);15份外源性ALV样品在细胞上清中初始检出p27抗原阳性时,同一培养时间的DF1细胞中的S/P值均明显高于细胞上清中的S/P值,差异极显著(P＜0.01);培养4～5 d的DF1细胞与第9天收集的细胞上清中p27抗原S/P值相关性最高,分别为0.946、0.923.本研究显示,检测培养4～5 d的DF1细胞中的ALV p27抗原与经典方法所要求的检测培养9d的细胞上清中的ALV p27抗原可达到相同的效果. 相似文献
5.
为研究HR土鸡中存在的不同亚型禽白血病病毒(ALV)共感染的情况,本实验分别采集46只HR土公鸡的泄殖腔棉拭子和455枚鸡蛋卵白样品,采用ELISA试剂盒检测p27抗原;并采用相应的ELISA试剂盒分别检测卵黄中J亚型ALV(ALV-J)和AB亚型ALV(ALV-AB)抗体。结果表明:HR土公鸡泄殖腔棉拭子样品中p27检出阳性率为87%(40/46),卵白检出率为74.7%(340/455);而卵黄中ALV-J和ALV-AB抗体阳性率分别为0(0/30)和80%(24/30)。无菌采集初步筛选p27抗原检测为阳性的5只HR土公鸡的抗凝血接种CEF,采用抗ALV-J和ALV-A的单克隆抗体进行IFA检测,结果显示5份样品中ALV-A和ALV-J的阳性率均为100%(5/5)。同时选取HR土鸡分离株HR332进行PCR扩增鉴定,结果表明分离株HR332存在ALV-J(HR332J)和ALV-A(HR332A)。其中,HR332J与11株ALV-J国内外参考株的同源性为92.4%～97.9%;HR332A与ALV-A参考株RSA-A、MQNCSU的同源性分别为90.1%和89.7%,与国内分离株SDAU09E2的同源性为99.0%。本研究显示,地方品种HR土鸡存在不同亚型ALV共感染,同时ALV-A和ALV-J共感染同一个鸡的现象已经存在。 相似文献
6.
《上海畜牧兽医通讯》2014,(4)
用IDEXX公司的禽白血病(ALV)3种ELISA试剂盒对广西规模鸡场不同类别鸡群的血清、喉头/泄殖腔棉拭子、蛋清样品进行禽白血病J亚群(ALV-J)抗体、A和B亚群(ALV-AB)抗体、p27抗原进行检测,发现规模场不同种类鸡群感染程度不同。血清中ALV-J阳性率11.33%(338/2 982),其中核心群鸡阳性率8.87%(86/970),生产群鸡阳性率为12.87%(138/1 072),种公鸡阳性率为12.13%(114/940);p27抗原检测蛋清阳性率为5.48%(43/785),喉头/泄殖腔棉拭子阳性率为15.25%(122/800),蛋清样品检出率低于喉头/泄殖腔棉拭子。另对2个场血清和蛋清ALV-AB、ALV-J、ALV(p27抗原)进行对应检测比较,发现三者没有线性关系,即ALV-J感染率高,ALV-AB和p27抗原检测率不一定高;ALV-AB抗体高,ALV-J和p27抗原阳性率也不一定高。 相似文献
7.
《中国兽医杂志》2015,(9)
为比较不同方法在测定J亚群禽白血病病毒(ALV-J)组织细胞半数感染量(TCID50)上的差异,将ALV-J传染性克隆r NX0101株同一病毒保存液以10倍梯度稀释后按照常规方法分别接种已长满DF-1细胞和鸡胚成纤维细胞(CEF)的96孔板,维持7 d后取所有细胞培养上清以ALV-p27抗原检测试剂盒检测p27抗原,细胞固定后以ALV-J特异性单克隆抗体JE9进行间接免疫荧光(IFA)检测,确定病毒感染孔后按照Reed-Muench法分别计算两种方法在两种细胞上的TCID50。结果显示,ELISA法测定该病毒在DF-1细胞和CEF细胞上的TCID50分别为10-5.4TCID50/0.1 m L和10-4.666TCID50/0.1 m L,而IFA法测定该病毒在DF-1和CEF细胞上的TCID50分别为10-6.333TCID50/0.1 m L和10-5.2TCID50/0.1 m L。结果表明,IFA比ELISA具有更高的灵敏度,并且ALV-J在DF-1细胞上复制能力比CEF更强,在DF-1细胞上测定ALV-J的TCID50更为科学。 相似文献
8.
9.
《中国兽医杂志》2015,(3)
为了解麻黄肉种鸡蛋清中内源性禽白血病病毒(内源性ALV)的分布情况,从广东某麻黄肉种鸡场采集1 038份蛋清,经ALV p27抗原ELISA检测出30份阳性蛋清;将阳性蛋清同时接种DF1和CEF细胞,培养7 d后,p27抗原ELI-SA检测到13份样品为DF1-CEF+;以这13份CEF+细胞培养物的基因组DNA为模板,经PCR扩增克隆测序最终得到了1株内源性ALV前病毒序列。将经ELISA、PCR和IFA等方法鉴定的该内源性ALV命名为HN1301株。基于遗传分析表明,HN1301株的前病毒基因序列与已知的E亚群毒株ev1、SD0501的相似性均为99.4%。表明该麻黄肉种鸡品系中存在有复制能力的内源性ALV,因而易干扰基于p27抗原的ELISA检测;本研究对于麻黄肉种鸡禽白血病的防控与净化有参考价值。 相似文献
10.
对自国外直接进口的蛋用型海兰褐祖代鸡群的禽白血病感染状态进行了持续观察,并与国内3个不同发病状况的海兰褐父母代鸡群的种蛋p27检出率、抗体阳性率、投诉情况进行了比较.将国外直接进口的蛋用型海兰褐祖代鸡群3个配套系240只1日龄鸡在SPF环境中饲养,在不同日龄采集泄殖腔棉拭子检测禽白血病病毒(A-vian leukosis virus,ALV)群特异性p27抗原、采集血清检测ALV-AB及J特异性抗体和采集血浆分离外源性ALV,并在鸡群开产后收集种蛋,检测蛋清p27抗原和父母代鸡群胎粪p27抗原.同时对来自天津、山东的不同投诉情况的3个父母代鸡场种蛋p27抗原或ALV-AB及J抗体进行了检测.结果显示,进口祖代鸡ALV-AB及J特异性抗体在68、150日龄检测均为阴性；分别在12、26、68、150日龄采血浆在DF1细胞分离病毒均为阴性；收集的250枚种蛋蛋清和孵化的父母代鸡群胎粪p27抗原检测均为阴性.而其他国内3个父母代鸡场的种蛋p27检出率最高达12％.结果表明,该海兰褐祖代鸡群无外源性禽白血病的感染,不同鸡群的种蛋p27检出率与病毒分离率 及发病情况具有较好的吻合性,可以作为开展ALV的流行病学调查和种鸡场净化的重要指标. 相似文献
11.
Erysipelas was diagnosed in a layer breeder flock in Sweden in 2002. Although vertical transmission of Erysipelothrix rhusiopathiae has not been previously described in chickens, the potential of erysipelas infection to adversely affect hatching eggs was of concern. To clarify the possible impact of erysipelas on hatching eggs and their progeny, an experiment was done using 200 hatching eggs collected from the infected flock. The eggs were incubated for 21 days, and the egg shells, infertile eggs, dead-in-shell embryos, and a sample of day-old hatched chicks and blood samples from 5-day-old chicks were cultured for E. rhusiopathiae. In addition, after 28 days of grow-out, the male chickens were euthanatized and cultured for the bacterium, and the remaining female chickens were placed as a backyard flock and observed over a 4-mo period. Bacteriological test results of the above-mentioned samples were negative for E. rhusiopathiae. Mortality rates were not excessive, and no clinical symptoms of erysipelas were observed during the period of observation. The result of the investigation suggests that in layer breeder chickens, E. rhusiopathiae is not vertically or egg transmitted and that the disease outbreak in the parent stock had no adverse impact on the quality of hatching eggs in terms of increased embryo mortality. 相似文献
12.
Two experiments were conducted to study the effects of age of the maternal flock (27 vs. 57 weeks of age at time the eggs were set) and strain of broiler chicks (Cobb 500, Ross, Arbor Acres, and Avian) on the incidence of tibial dyschondroplasia (TD) in broiler cockerels grown to 3 weeks of age. The chicks were fed a corn/soybean meal-based diet containing 3145 kcal metabolizable energy corrected for nitrogen retention (MEn)/kg, 24% protein, and 0.50% available phosphorus. Each treatment was replicated four times with eight chicks per pen. In Expt. 1, chicks from the old parent flock had significantly higher body weights (P < or = 0.05) than those from the young parent flock. There were no significant differences in feed efficiency or incidence of TD. In Expt. 2, body weights, feed efficiency, and TD were unaffected by strain. 相似文献
13.
山东不同品系蛋鸡禽白血病流行病学调查 总被引：4，自引：1，他引：3
为了解山东不同品系蛋鸡白血病流行情况,作者采集了山东各地区主要引进品系及地方品种鸡的血清3882份、棉拭子2428份和疑似病例41例,对采集样品分别进行了血清学、病理学及病原学检测.结果表明:包括祖代鸡在内的各品系蛋鸡群P27抗原阳性率为19.36%;ALV-A/B亚型抗体阳性率9.29%、ALV-J亚型抗体阳性率5.18%、REV抗体阳性率13.77%;发病鸡群主要是商品鸡群和父母代鸡群,海兰褐祖代鸡群也有发病;病理学诊断证明肿瘤类型主要为髓细胞瘤(27/41)、血管瘤或血管内皮细胞瘤(7/41)、纤维肉瘤(2/41)、平滑肌肉瘤(2/41)及马立克氏病(5/41);PCR检测结果显示,41份病料中有33份为ALV-J阳性(80.49%);22份为MDV阳性(53.66%);两者共感染率高达43.9%;从疑似病例分离到的17株ALV-J病毒gp85基因的同源性为94.0%～100%,与ALV-J原型株HPRS-103 gp85基因同源性为94.3%～98.7%;与其它已发表的分离毒株ALV-J gp85基因的同源性较低(84.4%～96.8%).调查结果表明,目前山东各品系蛋鸡群均存在ALV感染,其中以ALV-J为主,ALV-A和ALV-B同时存在,且存在与MDV、REV的混合感染,病鸡主要表现髓细胞瘤和血管瘤. 相似文献
14.
Enterococcus faecalis-related amyloid arthropathy was diagnosed in a sample of birds from a flock of brown layer parent chickens aged 57 weeks. E. faecalis was isolated from amyloidotic knee joints and from blood samples from lame birds. From this flock a smaller one was kept for production purposes to study the vertical transmission of arthropathic and amyloidogenic E. faecalis. Three batches of non-soiled and thoroughly disinfected eggs, to prevent egg-shell contamination, were collected for 6 weeks and submitted for incubation every 2 weeks. No joint pathology was found in the offspring chicks (n = 458) monitored for joint disease until 16 or 21 weeks of age. Fresh and candled eggs (infertiles and dead embryos) obtained at day 18 of the incubation period had negative results at bacteriological examination of the yolk sac, except one non-hatched egg (late embryonal death in shell) from which E. faecalis was isolated. Genotyping by pulsed-field gel electrophoresis (PFGE) of all E. faecalis isolates obtained from blood and joints (except one) of the parent birds and of the non-hatched egg after Sma I digestion showed that all isolates were genetically closely related or identical to a known arthropathic and amyloidogenic E. faecalis strain. In this study, vertical transmission of E. faecalis, although it may occur on a small scale as shown by PFGE, did not seem to play a significant role. Conversely, the chronicity of the condition and the development of an immune response may have affected the efficiency of its transmission. 相似文献
15.
Objective To describe two cases of infection with Fasciola hepatica i n young farmed emus, subacute and chronic fasci-olosis and a response to treatment of the flock with albenda-zole.
Procedure Gross lesions were found at necropsy and hepatic lesions in microscopic examination. The parasite recovered from one emu was identified by its morphological characteristics and an egg count reduction test was carried out after treatment of the flock with albendazole.
Results Hepatic lesions resembling subacute and chronic fasciolosis of ruminants were identified. An adult fluke was recovered from the liver of one of the birds and was identified as F hepatica . The eggs of the fluke were irregular in shape and size. No fluke eggs were identifiable in faeces of live emus 10 days after treatment of the flock with albendazole at a dose of 10 mg/kg.
Conclusions This is the first reported case of infection with F hepatica i n farmed emus and the first report of the occurrence of Fasciola infection is the class Aves. The irregular shape and size of the eggs may be attributable to infection of an aberrant host. Treatment with albendazole eliminated eggs from the faeces of the flock. 相似文献
Procedure Gross lesions were found at necropsy and hepatic lesions in microscopic examination. The parasite recovered from one emu was identified by its morphological characteristics and an egg count reduction test was carried out after treatment of the flock with albendazole.
Results Hepatic lesions resembling subacute and chronic fasciolosis of ruminants were identified. An adult fluke was recovered from the liver of one of the birds and was identified as F hepatica . The eggs of the fluke were irregular in shape and size. No fluke eggs were identifiable in faeces of live emus 10 days after treatment of the flock with albendazole at a dose of 10 mg/kg.
Conclusions This is the first reported case of infection with F hepatica i n farmed emus and the first report of the occurrence of Fasciola infection is the class Aves. The irregular shape and size of the eggs may be attributable to infection of an aberrant host. Treatment with albendazole eliminated eggs from the faeces of the flock. 相似文献
16.
M M Shanawany 《British poultry science》1984,25(4):449-455
A clear positive correlation was evident between egg weight at setting and embryo weight at 18 d of incubation for eggs laid at or after 32 weeks of age. The weight of embryos from the same size eggs were found to depend upon a curvilinear function of the age of parent flock, with the largest increase in embryo weight occurring between 28 and 32 weeks of age. Hatching weight was highly correlated with egg size at setting. Flock age had no effect on hatching weight from a particular sized egg. Within any of the five ages studied, chicks from smaller eggs tended to hatch slightly (but not significantly) earlier than those from larger eggs. 相似文献
17.
J IGNJATOVIC 《Australian veterinary journal》1990,67(8):299-301
Congenital transmission of avian leukosis virus (ALV) in the absence of detectable amounts of group specific (gs) antigen in egg albumen was found to occur in one commercial and one specific pathogen-free (SPF) flock. The prevalence of congenitally transmitting hens which did not excrete gs antigen was particularly high in a commercial flock where 26/27 hens transmitted ALV. Some of the ALV-transmitting hens in the commercial flock had virus in vaginal swabs thus enabling infection to be detected. The reasons for such a high proportion of congenitally transmitting hens which did not shed detectable amounts of gs antigen in the commercial flock was not determined. In the SPF flock, 2/15 hens congenitally transmitted ALV although virus could not be detected in vaginal swabs, whole blood or egg albumen and antibodies to subgroups A or B were not present. This form of ALV-infection persisted in two successive generations. These results indicate the necessity of testing for infectious ALV in embryos, in order to ascertain that a flock is genuinely free of ALV. 相似文献
18.
Outbreaks of clinical chicken anaemia in four broiler chicken flocks affected chicks which were all the progeny of the same parent flock. Three of the flocks were reared on farms in the south-east of England and in these flocks clinical disease did not occur in other chicks of the same age. The fourth flock was reared in a positive-pressure isolator and clinical disease appeared at 10 days of age. Chicken anaemia agent was isolated from three of the flocks. The clinical signs, post mortem lesions and histopathological changes were similar to those reported in outbreaks of the disease in other countries. The parent flock seroconverted to chicken anaemia agent, as determined by fluorescent antibody tests, during the course of the outbreaks. 相似文献
19.
Rhode Island Red laying hens that lacked hemagglutination-inhibition antibody were inoculated orally with the JPA-1 strain of adenovirus isolated from a flock affected with egg-drop syndrome-1976 in Japan and observed for 80 days. Inoculated hens laid abnormal eggs, such as shell-less, soft-shelled, and cracked eggs and those with loss of pigmentation, from 8 days postinoculation (PI). Fifteen out of 16 hens laid abnormal eggs. Egg-production rte fell from 94% to 50% between 13 and 16 days PI. When the abnormal eggs were excluded, egg production was 17%; then it recoverd slowly, reaching 67% by the end of the experiment. The virus was recovered from various organs of inoculated hens from 3 to 7 days PI. Fluorescent antigens of the virus were observed in the epithelial cells and desquamated cells from the epithelium of the uterus and isthmus 10 and 14 days PI. 相似文献
20.
A study involving 11 commercial layer flocks was conducted to determine the efficacy of Salmonella enteritidis bacterins (autogenous or federally licensed). The criterion for evaluation of vaccine efficacy was the presence or absence of S. enteritidis in the environment, the organs of the bird (including ovary and oviduct), and eggs. Environmental, rodent, and organ specimens from dead birds as well as eggs were cultured throughout the life of the flock. All layers were obtained from pullet sources that were negative for S. enteritidis, as determined by organ and environmental cultures. Despite the use of S. enteritidis vaccination, 63.6% of the houses had S. enteritidis-positive environmental cultures and 100% of the flocks had S. enteritidis organ-culture-positive birds. The range of positive cultures for S. enteritidis in the environment in vaccinated flocks was between 0 and 45.5%. Birds in vaccinated flocks were organ-culture positive for S. enteritidis between 10% and 40% of the time. The unvaccinated portion of flocks in the same house and the unvaccinated flock in a complex had similar results compared with the vaccinated portion of the flocks. 相似文献