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甘肃省集约化养猪场猪伪狂犬病的调查 总被引：1，自引：0，他引：1
伪狂犬病是由伪狂犬病病毒（ＰＲＶ）引起的多种动物的一种急性传染病，对猪的危害尤其严重，主要引起怀孕母猪流产、死胎或木乃伊胎以及产弱仔等，导致新生仔猪大量发病死亡，病死率可高达１００％；同时对成年猪呈现隐性感染或上呼吸道卡他性病症，给养猪业造成严重的经济损失。本病已在世界上５０多个国家发生暴发或流行，近几年在我国也有不少报道在集约化养猪场暴发流行了本病。甘肃省猪传染病的发病率也相当严重，仅１９９７年全省集约化养猪场和养猪专业户的各种传染病发病率就达１１％～１６％。病死猪７．１万头，病死率２．５％，… 相似文献
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１９９８—２０００年经对甘肃省３４个集约化养猪场的调查，甘肃省２０．５８％（７／３４）的养猪场有猪传染性萎缩性鼻炎（Ｒｈｉｎｉｔｉｓ ａｒｔｒｏｐｈｉｃａ ｓｕ－ｕｍ），临床发病率３．８２％（１３３８／３５ ０１３），血清学阳性率１４．０５％。１ 材料与方法１．１ 材料 细菌分离鉴定的培养基等。豚鼠，购自兰州生物药厂，猪萎缩性鼻炎乳胶凝集抗原、标准阴、阳性血清，购自华中农大。１．２ 方法１．２．１ 在省内１４个地区选３４个集约化养猪场，查阅记录，了解该病发生情况，并到猪舍观察是否有眼角泪斑、打喷嚏、鼻盘… 相似文献
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为了查清细菌性疾病在集约化养猪场的发病种类、感染流行程度及危害情况，1998－2000年在甘肃省14个地区34个养猪场通过座谈、查阅生产防疫记录、血清学调查、实验室诊断，开展了细菌性疾病的调查。结果，主要细菌性疾病的发病率分别为大肠杆菌病30．27％，传染性萎缩性鼻炎3．82％，喘气病4．49％，仔猪副伤寒1．85％，猪丹毒1．2％，猪肺疫0．85％。87例疫情中诊断的细菌性疾病中，大肠杆菌病占31．03％（27／87），仔猪副伤寒占8．02％（7／87），猪丹毒8．04％（7／87），猪肺疫6．89％（6／87），猪萎缩性鼻炎3．44％（3／87），猪链球菌病2．29％（2／87），李氏杆菌病1．15％（1／87）。对2000份猪血清的血清学检验结果，传染性胸膜肺炎的感染率为87．16％，猪衣原体病的感染率34．91％，萎缩性鼻炎的感染率为14．05％。34个集约化养猪场2月龄以下仔猪黄、白痢三年的发病率分别为34．40％，31．29％，20．48％，死亡率分别为18．14％，20．73％，16．73％。47．06％（16／34）的猪场中4．49％（1574／35013）的猪患有喘所病，4群患喘气病猪的育肥期平均推迟12d。根据座谈、生产防疫记录、87起疫情的诊断和2000份血清的检验结果，初步查明，大肠杆菌病、喘气病、传染性萎缩性鼻炎、传染性胸膜肺炎、衣原体病、仔猪副伤寒、猪丹毒、猪肺疫为甘肃省集约化养猪场的主要细菌性疾病。此外，还零星散发猪链球菌病、李氏杆菌病、仔猪红痢等。另外，对集约化养猪场的细菌性疾病的发病原因和防治措施进行了讨论。 相似文献
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甘肃省仔猪腹泻的流行情况调查 总被引：3，自引：0，他引：3
对甘肃省１３个地（州,市）２８个县（市,区）的６个大型种猪场,２８个规模化养猪场和６９户专业户养殖场１９９５～１９９７年上半年仔猪腹泻的流行,危害及免疫治疗效果等进行了突击调查,所调查的大型种猪场,规模化养猪场和专业户养猪场本病近３ａ的发病率分别为２１．０２％,５９．５５％和４８．８５％,２９．５５％,６４,３７％和５８．７６％,３０．８５％,６７．３８％和６１．６１％,死亡分别为１４．１３％,３ 相似文献
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在养猪生产过程中,每年都要定期补充后备母猪。更换基础母猪群中胎次较高的种猪．以保证猪群合理的胎次（年龄）结构,提高种猪繁殖效率和猪群的性能．从而取得较好的生产水平和经济效益。规模化猪场每年种猪更新率大约为25％～30％,小型养猪场或养猪专业户的比例则更高一些。 相似文献
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李松岭 《河南畜牧兽医(综合版)》2012,(4):39-40
经济效益是养猪专业户的最终目标．直接关系各专业养猪场的规模、结构和稳定发展。养猪的经济效益同猪的品种、饲料价格、管理水平以及市场信息等方面是分不开的。现通过调查分析，提出以下综合技术措施。供同仁和养猪场户参考。 相似文献
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自2002年1月份以来，笔者对安徽、江苏、江西、山东、湖北、上海等地17个集约化养猪场，进行了猪圆环病毒2型（PCV-2）感染的流行病学调查。此次调查，我们运用PCR方法，调查范围主要为断奶仔猪多系统衰竭综合症疑似发病猪场及正常猪群不同年龄阶段的猪。结果疑似猪群中，PCV-2检出率为60.6％（43／71），屠宰猪群的阳性率仅为6.7％（1／30），而初生仔猪（2-3日龄）的阳性率亦可达42.9％（15／35）。表明我国猪群中普遍存在PCV-2的感染。 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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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
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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