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5省区规模猪场猪呼吸道病综合征病原学调查的统计分析 总被引：1，自引：0，他引：1
对5省区规模猪场猪呼吸道病综合征(PRDC)的2 184份血清检测结果进行分析、归纳,结果显示,其主要病原是猪繁殖与呼吸综合征病毒、圆环病毒2型和伪狂犬病病毒,其中猪繁殖与呼吸综合征病毒阳性率为34.80%,圆环病毒2型阳性率为58.24%,伪狂犬病病毒阳性率为27.79%,而猪瘟病毒和猪流感病毒的感染率较低;上海市病料的主要病因是肺炎支原体(57.50%)和猪繁殖与呼吸综合征病毒(45.83%),海南省血清的主导病原是圆环病毒2型(90.5%)、胸膜肺炎放线杆菌(72.7%),说明肺炎支原体和胸膜肺炎放线杆菌的感染可能有一定的地域性;PRDC的混合感染率较高(广西43.77%,云南35.75%)。 相似文献
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安徽省芜湖地区猪瘟及猪繁殖与呼吸综合征混合感染情况的调查 总被引：1，自引：0，他引：1
对安徽省芜湖市7个猪场猪瘟及猪繁殖与呼吸综合征(又称猪蓝耳病)混合感染情况进行了调查,结果发现,发病猪血清中猪繁殖与呼吸综合征抗体阳性率达100%;采用荧光抗体法检测猪瘟病毒时,检出率为90%,且二者混合感染率达90%.表明该地区存在上述2种疾病流行的风险,应加强预防和控制. 相似文献
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安徽省猪呼吸道疾病五种病原的分离与鉴定 总被引：1，自引：0，他引：1
猪呼吸系统疾病目前是困扰我国养猪业主要疾病之一。为了弄清安徽省猪呼吸道疾病主要致病微生物,本研究利用细菌学鉴定技术、RT-PCR技术对2010年-2011年安徽省皖南、皖中、皖北地区采集的180份呼吸障碍性病(死)猪病料进行了猪繁殖与呼吸综合征病毒、圆环病毒2型、链球菌、巴氏杆菌、副猪嗜血杆菌等5种病原进行了分离鉴定。结果显示,猪繁殖与呼吸综合征病毒感染率高达68%,圆环病毒2型感染率高达83.3%;猪繁殖与呼吸综合征病毒与圆环病毒2型混合感染率达27.8%,猪链球菌感染率为22.8%。结果提示,猪繁殖与呼吸综合征病毒缺失株、圆环病毒2型、链球菌的普遍感染是近年安徽省猪呼吸道疾病的重要致病病原,研究结果为安徽省今后猪群呼吸道疫病防控策略的制定提供了参考依据。 相似文献
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研究旨在了解河池市屠宰猪群主要疫病感染情况,于2019—2022年采集屠宰猪群组织混合样品,应用实时荧光定量RT-PCR检测猪繁殖与呼吸综合征病毒（PRRSV）、猪瘟病毒（CSFV）、口蹄疫病毒（FMDV）、猪塞内卡病毒（SVA）,应用荧光PCR检测圆环病毒2型（PCV2）、圆环病毒3型（PCV3）、伪狂犬病毒（PRV）。结果显示,检测的1 745份样品中,除FMDV和PRV没有检出外,其余5种病原均有检出,样品总体阳性率由高到低依次为42.87%(PCV2)、11.63%(PCV3)、8.48%(PRRSV)、0.80%(CSFV)、0.80%(SVA);县区检出率依次为100.00%(PCV2)、100.00%(PRRSV)、90.91%(PCV3)、54.55%(CSFV)、27.27%(SVA);5种病原存在不同程度的混合感染。研究表明,圆环病毒病、猪繁殖与呼吸综合征和猪瘟在河池市及其周边地区猪群中流行普遍,需进一步加强监测和做好防控措施。 相似文献
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4种猪繁殖障碍性疫病流行病学调研与分析 总被引：1，自引：1，他引：0
猪繁殖障碍性疫病严重危害养猪业的发展,为了查清山西省这些疫病的流行情况,对全省8个地市42个规模化种猪场进行了流行病学调查,发现因母猪繁殖障碍病造成死亡的仔猪数平均可以占到总产仔数的13.77%,同时采集病料组织257份,不同日龄猪群血清1776份,用不同病原的PCR和ELISA试剂盒对猪瘟、猪繁殖与呼吸综合征、猪伪狂犬病和猪圆环病毒2型等进行了病原和抗体检测,结果表明,猪瘟病毒感染率为28.4%,抗体阳性率为57.55%;猪繁殖与呼吸综合征感染率为3.89%;猪繁殖与呼吸综合征变异株感染率为39.69%,抗体阳性率为44.99%;猪伪狂犬病病毒感染率为10.12%;gE抗体阳性率为2.98%,gB抗体阳性率为76.35%;猪圆环病毒2型感染率为15.18%,抗体阳性率为56.98%,证明山西省种猪场4种疫病感染较为严重,并且常常发生混合感染,为今后山西省防控这些疫病提供了依据。 相似文献
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为了评估怀化市屠宰场健康猪群病原的隐性感染情况,使用荧光PCR检测技术对市内2个屠宰场共360份健康猪扁桃体进行了口蹄疫病毒(FMDV)、高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)、猪繁殖与呼吸综合征病毒(PRRSV)、猪伪狂犬病病毒(PRV)、猪圆环病毒2型(PCV2)、猪瘟病毒(CSFV)等主要猪病原进行核酸检测。结果显示,屠宰场内外观健康猪群中的病原阳性率分别为PCV2 82.78%、PRRSV 13.61%、HP-PRRSV 3.89%、PRV 3.89%、FMDV 3.06%、CSFV 0。表明健康猪群中携带PCV2比较普遍,其他病原也有一定的携带率。 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