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广东部分规模猪场猪流感血清学监测结果与分析 总被引：10，自引：1，他引：10
从广东省9市17县采集28个规模猪场种公猪、后备和经产母猪血清627份,用微量血球凝集抑制(HI)试验监测H1、H3、H5、H9亚型猪流感抗体。结果表明:所监测猪场大部分猪群存在H1亚型猪流感抗体,场阳性率为75%(21/28),猪群血清抗体阳性率在8%～100%之间,总阳性率为46.09%(289/627);部分猪群存在H3亚型猪流感抗体,场阳性率为28.57%(8/28),猪群血清抗体阳性率在10%～95%之间,总阳性率为12.76%(82/627);未监测到H5、H9亚型猪流感抗体的存在。 相似文献
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甘肃省猪流感H5和H9抗体的血清学调查 总被引：2，自引：1，他引：1
用血凝（HA）和血凝抑制试验（HI）对甘肃省742份猪血清进行了猪流感H5和H9亚型抗体检测。在12个市州的猪群中检出SIH9亚型抗体,检出阳性34份,平均阳性率为4．58％。阳性率最高为9．09％,最低为0．91％。在2个市州的猪群中检出SIH5亚型抗体,检出阳性3份,平均阳性率为0．40％。阳性率最高为4．76％,最低为2．98％。检测患病猪（非流感病）血清66份,其中8份检测出SIH9抗体．抗体阳性率为12．12％。 相似文献
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安徽省部分地区猪繁殖与呼吸综合征及猪流感的血清学调查 总被引：10，自引：5，他引：5
采集了安徽省南部10个地区79个发病猪场348份猪血清,用ELISA试剂盒检测了血清中猪繁殖与呼吸综合征及H1N2和H3N1亚型猪流感病毒抗体水平.结果表明,10个地区猪血清中PRRSV抗体均为阳性,阳性率为70.4%;6个地区猪血清中H1N1亚型和H3N2亚型猪流感抗体为阳性,但阳性率分别只有3.5%和4.0%.提示在2006年夏季,发生于安徽省南部部分地区的"猪高热病"的原发病之一为猪繁殖与呼吸综合征. 相似文献
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广东部分地区H1和H3亚型猪流感抗体监测和病毒分离 总被引：2，自引：0，他引：2
从广东省17个未免疫猪流感病毒(SIV)疫苗的规模化猪场和3个肉联厂的待屠宰猪群中采集2 155份血清样品,采用ELISA方法进行猪流感的血清学调查。结果发现,种猪和肉猪H1亚型猪流感抗体阳性率分别为39.6%(329/830)和37.6%(498/1325),H3亚型抗体阳性率分别为10.8%(90/830)和4.6%(61/1325),H1+H3阳性率分别为5.2%(43/830)和1.8%(25/1325)。从281份猪鼻拭样品和肺样品中分离并鉴定出5株猪流感病毒,其中H1N1亚型3株,H3N2亚型和H1N2亚型各1株。 相似文献
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用酶联免疫吸附试验(ELISA)对2012年上海市某地区27个养殖场户1 760份猪血清样品进行了猪流感(H3N2)血清学抗体检测。检测结果表明,在27个养殖场户中均检出H3N2抗体阳性,共检出阳性320份,阳性率为18.18%。 相似文献
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广东云浮部分猪场猪流感血清学调查与分析 总被引：3，自引：0，他引：3
从广东云浮市猪场采集39个猪场种公猪、后备和经产母猪血清1506份,用微量血球凝集抑制(HI)试验监测H1、H3、H5、H9亚型猪流感抗体。结果表明:所监测猪场大部分猪群存在H1亚型猪流感抗体,场阳性率为71.79%(28/39),猪群血清抗体阳性率在22.2～100%之间,总阳性率为59.07%(890/1506);部分猪群存在H3亚型猪流感抗体,场阳性率为74.35%(29/39),猪群血清抗体阳性率在5～100%之间,总阳性率为67.75%(1020/1506);未监测到H5、H9亚型猪流感抗体的存在。 相似文献
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为了解本地养猪场H3N2亚型猪流感的流行情况,2015~2017年,在东莞市本地养殖场采集了873份猪血清,采用酶联免疫吸附试验方法检测H3N2亚型猪流感抗体,结果为H3N2亚型猪流感抗体阳性501份,抗体阳性率为57.39%,其中2015~2017年的抗体阳性率分别为24.20%、66.21%、69.66%,抗体阳性率呈上升的趋势。结果表明,东莞市本地养猪场存在H3N2亚型猪流感的流行,2015~2017年抗体阳性率的上升趋势可能与近年来东莞市人流行的H3亚型甲型流感有相关性。 相似文献
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中国猪源HSN1和H9N2亚型流感病毒的分离鉴定 总被引：41，自引：5，他引：41
猪是禽流感病毒"禽-猪-人"传播链中重要的中间宿主,了解猪流感的疫情动态将为动物流感及人流感的疾病预测及防制提供重要依据.1999～2001年间进行的血清学和病毒学监测发现我国猪群存在大范围的H1和H3亚型猪流感感染(李海燕等,2002).2002～2003年,我们进一步对来自全国14个省市的1936份血清进行了H9亚型猪流感的检测,同时在广东、福建等省进行了H5亚型猪流感的检测.2002年辽宁、广东、山东及重庆猪血清中出现H9亚型流感抗体,阳性率分别为7.3%、6.8%、5.1%和1.6%.2003年采集的猪血清H9亚型流感抗体均为阴性,同时发现广东、福建两省2003年出现H5亚型流感阳性猪群,阳性率分别为4.7%和8.2%.从2001～2003年收集和送检的样品中分离鉴定了6株H9N2亚型和2株H5N1亚型猪流感病毒,部分序列分析发现H9和H5亚型猪流感病毒均与我国分离的禽流感病毒高度同源.本研究进一步确证了我国猪群中存在H9N2亚型流感病毒,并且首次发现我国猪群已出现H5N1亚型流感病毒,为人类流感及动物流感的防制敲响了警钟.对这两个亚型流感病毒所具有的公共卫生和兽医公共卫生危害性应予以高度重视. 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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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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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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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