共查询到20条相似文献,搜索用时 62 毫秒
1.
为探讨新型禽流感病毒三价灭活疫苗(H5N6 H5-Re13株+H5N8 H5-Re14株+H7N9 H7-Re4株)对蛋鸡的免疫效果,研究不同免疫剂量与次数对抗体滴度的影响。将160羽35日龄海兰褐蛋鸡随机分为四组,即单次免疫组(Ⅰ组、Ⅱ组)和两次免疫组(Ⅲ组、Ⅳ组)。其中,Ⅰ组接种0.5 mL疫苗,Ⅱ组接种1.0 m L疫苗,Ⅲ组首免和二免各接种0.5 m L疫苗,Ⅳ组首免接种0.5 mL疫苗,二免接种1.0 mL疫苗。在首免接种后的第21 d、90 d、150 d、180 d测定血液抗体滴度。结果表明:免疫接种21 d后,Ⅳ组的3种抗体滴度均达7.9log2以上,合格率达95%以上,两次免疫组(Ⅲ组、Ⅳ组)的抗体保护期达180 d以上,Ⅲ组与Ⅳ组差异不显著。 相似文献
2.
本文通过在武威市随机选择的4个蛋鸡场各挑选100羽蛋鸡,对其进行同群饲养管理,颈部皮下注射不同剂量的同一批次禽流感疫苗.间隔一定时间后采样,检测其抗体水平并计算抗体阳性率.结果:免疫剂量为0.5 mL/羽、0.6 mL/羽和0.7 mL/羽的试验组抗体效价阳性率达到(70%以上)免疫合格要求;0.4 mL/羽和0.9 mL/羽的剂量组抗体效价阳性率都未达到70%以上.结果表明:免疫剂量为0.6 mL/羽的免疫效果最佳,并不是免疫剂量与产生的免疫抗体效价阳性率成正比. 相似文献
3.
为评估不同免疫剂量禽流感灭活疫苗对父母代蛋种鸡产蛋率及抗体效价的影响,在河北省某海兰褐蛋种鸡场挑选产蛋稳定的720羽55周龄蛋种鸡,平均分为6组,每组4个重复,每个重复30羽;试验组分别胸部皮下注射0.2、0.3、0.5、0.7 mL/羽的重组禽流感病毒H5+H7三价灭活疫苗(H5N1 Re-11株+Re-12株,H7N9 Re-3株),同时设0.5 mL生理盐水组及不免疫空白对照组;统计免疫前及免疫后1~4周各组的产蛋率,并分别在免疫前及免疫后3、6、10、14周采血,检测其抗体水平。结果显示:免疫后2周,0.7 mL组产蛋率下降幅度最大,与对照组差异极显著(P <0.01),而0.2 mL组下降幅度最小,与对照组差异不显著(P> 0.05)。各免疫组免疫后3周的H5N1 Re-11抗体水平与免疫前相比均显著上升(P <0.05),免疫后14周0.2 mL组与0.7 mL组抗体滴度最高,均为8.60log2;免疫后3周的H7N9 H7-Re3抗体水平与对照组相比均显著上升(P <0.05),且各免疫组间的上升幅度差异均不显著(P> 0.05),免疫后14... 相似文献
4.
5.
家禽不同阶段注射禽流感疫苗抗体效价监测与对比 总被引:1,自引:0,他引:1
高致病性禽流感是直接危害家禽和人类健康的一种高致病性传染病,已被世界动物卫生组织(OIE)列为A类传染病。为有效地控制高致病性禽流感,本文在七台河地区用H5N1亚型重组禽流感病毒灭活疫苗对800只家禽(鸡400只、鹅400只)进行免疫和抗体效价监测对比试验。其中鸡分为A1、A2两组,鹅分为B1、B2两组,每组各200只。A1、B1两组进行1次免疫,A2、B2两组进行加强免疫1次,对其结果进行对比分析。结果表明,A1、A2、B1、B2四组均为注射疫苗20天后产生抗体,免疫期分别为160天、160天、100天、120天。通过对七台河地区800只家禽高致病性禽流感免疫抗体水平监测和对比分析,揭示了高致病性禽流感疫苗在不同品种和不同免疫次数家禽中产生抗体合格的最佳时间和不合格时间,为本地区制定高致病性禽流感防控方案提供了科学依据。 相似文献
6.
7.
8.
9.
取蛋鸡场的鸡群作为试验对象进行禽流感免疫。结果显示,H5Re-6株疫苗抗体滴度都在4log2以上,达到了群体免疫的效果。通过对H5免疫抗体滴度的测试,发现在蛋鸡开产前经3次以上免疫,开产时均能达到较高抗体滴度(H5抗体滴度大于6log2),为产蛋期蛋鸡提供了较高的抵抗能力。产蛋期2~3次免疫接种抗体可以维持较稳定的高水平,因而在鸡蛋里也保存了较高的母源抗体,为商品代鸡提供了很好的免疫保护。产蛋期的免疫间隔以12~16周为宜。 相似文献
10.
11.
12.
通过对禽流感免疫抗体进行监测与分析,全面掌握禽流感的免疫效果,提高预警能力,指导养殖场(户)制定合理的免疫程序。 相似文献
13.
14.
本试验调查沈阳地区28家蛋鸡养殖户及鸡场,样本数量达到15万只蛋鸡,日龄范围从30至500日龄不等,采集了其中50只病鸡的排泄物和内脏样品用于检测和分析。采用鉴别培养基和生化试验对样品进行细菌分离鉴定,再对检出的大肠杆菌进行Ο抗原鉴定。结果表明,在所采集的样品中大肠杆菌检出49例样品为阳性,检出率为98%;鉴定出大肠杆菌36株,定型30株,定型率为83.33%。药敏结果表明,仅恩诺沙星和氟苯尼考对全部采集到的大肠杆菌菌株高敏,其余药物多中敏或轻敏;而传统的青霉素、链霉素多表现为耐药。 相似文献
15.
从某一已免疫禽流感的种鹅场采取30份血样,分别以健康鸡红细胞悬液和健康皖西白鹅红细胞悬液为指示剂,对30份血样进行禽流感血凝和血凝抑制试验。结果:用鸡红细胞悬液作指示剂进行血凝试验,测出抗原4HAU为1:32;用鹅红细胞悬液作指示剂进行血凝试验,测出抗原4HAU为1:8以1:32倍数稀释抗原,分别用鸡红细胞和鹅红细胞悬液作指示剂进行血凝抑制试验,测出30份鹅血清禽流感H5免疫抗体效价的平均值分别为2^5.8和2^3.9;以1:8倍数稀释抗原,用鹅红细胞悬液作指示剂进行血凝抑制试验,测出30份鹅血清禽流感免疫抗体的平均效价为2^5.1。 相似文献
16.
Argasid ticks are one of the most important poultry ectoparasites. They affect poultry directly through blood meal and indirectly through the transmission of pathogens essentially Borrelia anserina, agent of avian borreliosis, one of the most widespread poultry diseases in the world, and is of great economic importance. This study was conducted between April 2014 and March 2015 in the region of Ksar El Boukhari, Algeria, in order to investigate the presence of soft ticks in laying hen farms and to detect B. anserina bacteria using molecular tools. DNA was extracted and screened for the presence of Borrelia spp. DNA by real-time polymerase chain reaction (qPCR). Borrelia spp. screening was performed using primers and probe targeting the 16S rRNA gene. A total of 83 traditional laying hen farms were visited, of which 39 (46.98 %) were found infested with A. persicus tick. Molecular analysis revealed that 2/34 (5.88 %) of ticks were infected by B. anserina. None of the ticks tested were positive for Rickettsia spp., and Coxiella burnetii. These results constitute the first report in Algeria of A. persicus harboring B. anserina. 相似文献
17.
日粮添加柠檬酸对蛋鸡生产性能的影响 总被引:1,自引:0,他引:1
采用六处理三重复单因子试验研究0%、0.05%、0.15%、0.25%、0.35%和0.55%柠檬酸添加水平对蛋鸡生产性能的影响,并分析各柠檬酸添加水平对蛋鸡高温期间生产性能的影响。结果表明:0.05%~0.55%柠檬酸添加量显著降低整个试验期和试验高温期的软、破蛋率(P<0.05),对其它生产指标无显著影响(P>0.05)。 相似文献
18.
S. Świątkiewicz J. Koreleski A. Arczewska-Włosek 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(2):125-128
Abstract The aim of the study was to evaluate the effect of organic acids and prebiotic fructans added to the layer's diet on balance of calcium, phosphorus, and zinc. The basal experimental diet contained 3.30% Ca and 0.60% P, and was either unsupplemented or supplemented with additives as follows: 0.75% inulin, 0.75% oligofructose; 0.50% short-chain fatty acids (SCFA); 0.25% medium-chain fatty acid (MCFA); 0.30% SCFA+0.20% MCFA; and 0.75% inulin+0.50% SCFA. It was concluded that some additives used in the experiment had a positive effect on the mineral balance in hens. Inulin significantly improved retention of Ca, P, and Zn, SCFA – retention of Ca, SCFA+MCFA – retention of Zn, inulin+SCFA – retention of P and Zn. 相似文献
19.
Namata H Méroc E Aerts M Faes C Abrahantes JC Imberechts H Mintiens K 《Preventive veterinary medicine》2008,83(3-4):323-336
Since the 1980s, the prevalence of Salmonella in Belgian poultry layers and broilers has greatly fluctuated with a rise observed in 2003 and a significant decrease in 2005. In order to alleviate the risk at egg consumer level, it is crucial to understand the factors which influence the contamination and the spread of Salmonella in laying hens. To study such determinants we explored the Belgian data from the 2005 baseline study on the prevalence of Salmonella in laying flocks of Gallus gallus in the European Union. The response variables corresponded to presence or absence of Salmonella from dust and faecal samples taken from the environment of a Belgian layer flock. The explanatory variables included: region of Belgium, sampling time (month the flock was sampled), production type (cage or barn and free range), Salmonella vaccination status, flock age and flock size. Analyses of these data were performed using a bivariate logistic regression model assuming independence between the two responses and bivariate generalized estimating equations model, which incorporates the correlation between the two responses on the same flock. The main risk factor that was identified was rearing flocks in cages compared to barns and free-range systems. The results also showed a significant higher risk for Salmonella for a 1 week increase in flocks’ age as well as with a unit increase in the size of the flock. 相似文献