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鸡新城疫疫苗对不同鸡群的免疫试验 总被引:1,自引:0,他引:1
通过对母源抗体消长规律的测定,从而为鸡新城疫疫苗的首次免疫提供了依据,在此基础上,用不同的鸡新城疫疫苗分别对雏鸡进行免疫,并监测其抗体的消长。根据监测的结果看出,经用ND CO-30和ND(Lasota系)活疫苗滴鼻、点眼的雏鸡,抗体可维持到21d,然后需再次进行免疫;而在7日龄时用ND活疫苗滴鼻、点眼的同时注射ND油乳剂灭活疫苗的雏鸡,抗体可保持到60d以上。经对国产苗和进口苗的比较,两种疫苗的结果基本一致,差异不显著,但在价格方面,国产苗比进口苗占有优势。 相似文献
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在大型集约化养鸡场进行喷雾免疫,具有省时、省力、应激小等特点。但在实际操作中应注意避免不利因素并正确实施喷雾免疫。 解决或避免不利于进行喷雾免疫的 鸡舍环境及鸡群的状态问题 1减少舍内灰尘 舍内灰尘会粘附于疫苗雾滴上进入呼吸道,不但引起呼吸道疾病,而且降低疫苗效力。因此在舍内干燥时 (尤其垫料平养肉种鸡 ),在喷雾免疫前半小时先喷水,但不能进行带鸡喷雾消毒。喷水应喷成雾状,高度在 1.7米左右,以沉降舍内空气中的灰尘,提高湿度。 2防止鸡群应激 喷雾免疫时禁止通风,关掉排风扇后鸡舍内变得安静,此时若同时进去 4~… 相似文献
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免疫接种是预防禽类疾病的有效措施,其中喷雾法是鸡群免疫有效的方法,特别适合于群体免疫。但在养殖户中常常因为免疫方法不当造成免疫失败,严重时造成巨大经济损失。下面就如何正确使用好喷雾免疫谈几点体会,供大家参考。 相似文献
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随着养鸡业的不断发展,其饲养管理水平、疫病防治技术都有了很大的提高.但近几年来,鸡的各种传染病流行得很严重,给养鸡业造成很大的危害.究其原因:主要是由于防疫失败起不到预防免疫的效果所致.本人认为主要有以下几方面的原因: 相似文献
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Branton SL Roush WB Lott BD Evans JD Dozier WA Collier SD Bearson SM Bearson BL Pharr GT 《Avian diseases》2005,49(1):147-151
Vaccination of commercial layer chickens is labor intensive and often results in poor rates of seroconversion, which, in turn, generally correlate with decreased flock uniformity and performance. Attempts to improve the vaccination process include numerous variations of individual shop-built vaccinators in use by the layer sector of the poultry industry. Each of these vaccinators has limitations that contribute to poor vaccinations. Major problems include the nonuniform speed of the applicator system and pressure fluctuations at the spray nozzles, which contribute to sporadic dispersion of the vaccine as the vaccinator is pushed or carried past the cages. A battery-powered, self-propelled, constant-speed vaccinator was designed and constructed that operates with constant nozzle pressure. In field use, this vaccinator has resulted in both labor savings (reduction of manpower from five to one to vaccinate 75,000 chickens) and time savings (from 45 min to 7.5 min/poultry house) as well as improved vaccination results (higher positive seroconversion rates) against the poultry pathogen Mycoplasma gallisepticum (MG), a bacterium associated with losses of 15.7 eggs/hen over a 45-wk laying period in MG-infected layers as compared with layers maintained free from infection with MG. 相似文献
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从20世纪80年代开始,我国的养鸡逐渐摆脱了后院式的生产模式,走向了集约化、产业化和现代化。虽然到目前为止我们大多数养殖场的现代化程度还不高,但是却为我国畜牧业的发展做出了巨大贡献,为消费者提供了足够的鸡、蛋,丰富了人们的菜篮子。随着我国经济的发展和经济体制改革的不断深入,我国的养鸡业在上世纪90年代初开始发生了显著的变化,即养殖的主体由城市郊区向农村转移,大城市国有大鸡场定位在高端产品产业。进入21世纪,养鸡的效益不稳定甚至有时亏损, 相似文献
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<正>笔者曾撰写过一篇《为什么养鸡养猪难赚钱》的文章,引起了很大的反响,有上千个养殖场的老板通过各种方式与笔者取得了联系表示 相似文献
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Use of modified live feline panleukopenia virus vaccine to immunize dogs against canine parvovirus 总被引:3,自引:0,他引:3
Modified live feline panleukopenia virus (FPLV) vaccine protected dogs against canine parvovirus (CPV) infection. However, unlike the long-lived (greater than or equal to 20-month) immunity engendered by CPV infection, the response of dogs to living FPLV was variable. Doses of FPLV (snow leopard strain) in excess of 10(5.7) TCID50 were necessary for uniform immunization; smaller inocula resulted in decreased success rates. The duration of immunity, as measured by the persistence of hemagglutination-inhibiting antibody, was related to the magnitude of the initial response to vaccination; dogs with vigorous initial responses resisted oronasal CPV challenge exposure 6 months after vaccination, and hemagglutination-inhibiting antibodies persisted in such dogs for greater than 1 year. Limited replication of FPLV in dogs was demonstrated, but unlike CPV, the feline virus did not spread to contact dogs or cats. Adverse reactions were not associated with living FPLV vaccination, and FPLV did not interfere with simultaneous response to attenuated canine distemper virus. 相似文献
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Antibodies to TRT in chickens with swollen head syndrome 总被引:1,自引:0,他引:1
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利用不同品种的良种蛋鸡与本地地方鸡杂交,以提高地方鸡产蛋量、蛋重和淘汰鸡体重.试验Ⅰ、Ⅱ、Ⅲ、重组分别为湖北红鸡(?)×地方鸡(?)、地方鸡(?)×湖北红鸡(?),地方鸡(?)×罗曼褐商品代(?).第Ⅳ组为地方鸡(?)×地方鸡(?).试验结果表明:Ⅰ、Ⅱ、Ⅲ组与Ⅳ组相比,20周龄体重、42周龄体重、72周龄淘汰鸡体重、产蛋量、蛋重均能有效得到提高,其中42周龄体重和72周龄淘汰鸡体重Ⅰ、Ⅱ、Ⅲ组之间差异不显著,与Ⅳ组相比差异极显著,42周龄平均蛋重Ⅰ、Ⅱ、Ⅲ、组与Ⅳ组相比差异极显著,Ⅲ组与Ⅰ、Ⅱ组相比差异显著.42周龄单枚蛋重Ⅰ、Ⅱ、Ⅲ组与Ⅳ组相比分别增加7.4g、8.54g和10g,72周龄产蛋量Ⅰ、Ⅱ、Ⅲ组与Ⅳ组相比分别增加41、35,55枚. 相似文献