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两种不同猪瘟疫苗免疫抗体消长规律研究试验 总被引:1,自引:0,他引:1
猪瘟是由猪瘟病毒引起的一种热性高度接触传染性疾病,世界动物卫 生组织(OIE)将此病列为A类传染病,我国将它列为一类动物疫病.各个年龄阶段的猪群, 不分品种对该病均易感,是危害我国养猪业的主要传染病之一,给养猪生产造成了严重的经 济损失.目前,对该病尚无有效的治疗药物,疫苗免疫是唯一有效预防该病的手段[1 ],但 只有选择最佳疫苗和制定合理的免疫程序,才能发挥疫苗对猪群的最大保护作用.本文选用 成都精华生产的猪瘟脾淋组织苗和猪瘟弱毒组织灭活疫苗对仔猪进行免疫,检测比较猪体内 猪瘟免疫抗体消长情况,为养猪场制定最佳免疫程序及疫苗选择提供科学依据. 相似文献
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猪瘟(Hog cholera,HC),又称古典猪瘟(classical swine fever,CSF)是由猪瘟病毒(HCV)引起的急性、热性、高度接触性的病毒性传染病。世界动物卫生组织(OIE)将此病列为A类传染病,我国将其列为1类动物疫病,是危害我国养猪业的主要传染病之一,给养猪生产造成了严重的经济损失。目前,对该病尚无有效的治疗药物,疫苗免疫是唯一有效预防该病的手段,但只有选择最佳疫苗和制定合理的免疫程序,才能发挥疫苗对猪群的最大保护作用。 相似文献
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4种商品化试剂盒检测猪瘟病毒抗体的比较分析 总被引:2,自引:0,他引:2
猪瘟(CSF)是由猪瘟病毒感染引起的猪的急性、热性、高度致死性传染病,是严重影响养猪业发展的主要疫病之一.世界动物卫生组织(OIE)将其列为A类16种传染病之一,我国亦将其列为一类传染病,是发生最多、危害最大、流行最广的动物传染病之一.由于长期贯彻预防为主的指导思想,坚持广泛接种猪瘟兔化弱毒疫苗的防治措施,该病在我国已经得到有效控制,大规模的暴发流行基本停止[1].2009年,一些猪场发生典型的猪瘟,给猪场造成了极大的经济损失[2],致使许多兽医工作者和养猪业主对我国猪瘟疫苗的免疫效果产生了怀疑,从而给我国猪瘟的防制工作带来新的问题. 相似文献
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正口蹄疫是由口蹄疫病毒引起偶蹄动物的一种急性、高度接触性传染病,被世界动物卫生组织(OIE)和联合国粮农组织(FAO)列为A类烈性传染病,我国将其列为一类动物传染病。口蹄疫在世界上许多国家地区都有发生和流行,对各国养殖业造成巨大经济损失。目前,发达国家控制口蹄疫主要采取扑杀、无害化处理等措施。我国采取以疫苗强制免疫为主的综合措施来防控口蹄疫,主要是通过疫苗免疫使动物产生抵抗该病的有效抗体, 相似文献
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闽西地区规模化猪场猪瘟抗体水平的监测与分析 总被引:1,自引:0,他引:1
猪瘟是猪瘟病毒引起的一种高度接触性传染病,世界动物卫生组织(OIE)将其列为A类16种传染病之一,我国亦将其列为一类传染病,是发生最多、危害最大、流行最广的传染病.多年来我国采用免疫接种为主的防控措施,大大降低猪瘟的感染率和发病率,大规模的流行暴发已少见,但是由于疫苗质量不够稳定,免疫程序不合理,缺乏免疫监测,猪群免疫抑制性疾病的存在,以及免疫操作不当等因素,导致免疫失败,猪瘟仍然是危害我国猪群最严重的传染病,猪瘟的免疫防控成为规模化猪场疫病防控的基础和重点,所以对猪群的猪瘟抗体进行监测,及时掌握猪瘟疫苗的免疫状况,对防控该病具有重大的意义. 相似文献
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新城疫(Newcastle Disease,ND)是指由新城疫病毒(NDV)所引起的一种禽类的急性、高度接触性传染病。该病是危害世界和中国养禽业最严重的传染病之一,被国际兽疫局(OIE)列为A类传染病。目前,接种疫苗是有效预防该病的措施,由于多种因素的影响,新城疫疫苗免疫有时不能取得较为理想的保护水平,研究如何科学应用疫苗预防该病具有十分重要的意义,本文旨在监测新城疫母源抗体、新城疫疫苗首免和二免后抗体的水平,探索其消长规律,以有效评估鸡群的免疫效果,并指导养鸡场选择适当时机进行科学免疫,有效预防新城疫的发生。 相似文献
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鸭瘟是由鸭瘟病毒引起的一种急性、接触性、败血性传染病。我国动物防疫法将其列为二类疫病,是当前危害我国养禽业发展的主要疫病之一。该病的发生与疫苗质量、免疫剂量、免疫程序、免疫状况、防疫意识、兽医检疫、环境因素和饲养管理条件等诸多因素紧密相关。本文就鸭瘟发生的 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献