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刘彦欣 《畜牧兽医科技信息》2021,(1)
近年来,随着非洲猪瘟的传入,对我国生猪养殖造成了严重的威胁。由于没有防控非洲猪瘟的疫苗和药物,使得该病的防控变得非常困难。为了有效做好非洲猪瘟的防控工作,加强生猪养殖建设,本文分析了目前非洲猪瘟防控工作存在问题,提出了改进措施,希望有助于该领域的研究。 相似文献
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非洲猪瘟是一种烈性的动物传染病,家猪感染之后病死率最高可达到100%。非洲猪瘟是由非洲猪瘟病毒引发的,目前还没有特效的治疗药物和有效的商品化疫苗,所以做好对非洲猪瘟的防控依然是生猪养殖行业最重要的工作之一。非洲猪瘟自2018年首次传入我国后在多地暴发,随着我国农业部门出台一系列防控举措,已将该病造成的损失降到最低。本文借鉴了国外防控经验,并结合国内非洲猪瘟疫情形势,总结了国内外一些防控非洲猪瘟的举措,以期为生猪养殖行业提供参考。 相似文献
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《畜牧兽医科技信息》2021,(8)
非洲猪瘟是由非洲猪瘟病毒引起的急性高度传染性疾病,能感染家猪和各类野猪。该病是我国重点防范的一类动物疾病,其发病过程短,死亡率高达100%。2018年8月非洲猪瘟首次传入我国辽宁省沈阳市后,迅速向全国各个地区蔓延,不仅对养殖业造成毁灭性灾害,还给人类的食品安全埋下隐患。目前该病并未研发出疫苗和特效药物,只能做好生物安全防控工作,控制疫情发展。 相似文献
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非洲猪瘟(ASF)是由非洲猪瘟病毒(ASFV)感染引起的一种危害性极强的病毒性传染病,该病的发生和流行对全球养猪业、猪肉食品供应及经济发展造成了巨大影响.自2018年非洲猪瘟传入我国以来,许多猪场采取生物安全、中药等来防控,目前我国的ASF流行情况出现了新的变化,临床中出现了"自然变异株",临床症状不典型,检测拔牙防控效果降低等问题.充分认清ASF现状,采取切实防控方案已成当务之急. 相似文献
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杨军 《畜牧兽医科技信息》2021,(3):45-45
非洲猪瘟是2018年8月新传入我国的猪的烈性传染病,被我国列为一类动物疫病,由于广大养殖人员对新传入的疾病缺乏了解和应对措施,使该病给养猪业造成了重大打击。该病危害性大、传染性强、致死率高,本文主要探究小型生猪养殖场及散养户防控非洲猪瘟的措施,以期为非洲猪瘟防控工作提供一些有效的建议。 相似文献
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张险朋 《畜牧兽医科技信息》2019,(7)
非洲猪瘟是一种由非洲猪瘟病毒引起猪的烈性传染病,此病原发于非洲,之后相继蔓延至欧洲和南美洲,2007年传入高加索地区,引起了国际社会的高度关注。2018年8月传入我国,随后大多数省份相继发生了非洲猪瘟疫情。目前非洲猪瘟尚无有效的疫苗用于预防,扑杀和根除是发生疫情后唯一可采取的防控措施,对疫情早期诊断显得尤为重要,本文对非洲猪瘟病原和血清抗体的实验室检测技术进行综述,为非洲猪瘟防控提供参考。 相似文献
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非洲猪瘟是一种危害性极大的生猪疫病,自从2018年传入我国后,对我国的生猪生产造成了严重影响.目前,非洲猪瘟疫苗暂时未研发成功,针对该病也没有特效药物,防控难度较大.笔者根据现有的知识和自身的工作实际,对非洲猪瘟的特征及防控举措展开一个浅显的探讨. 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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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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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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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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Fractures of the anconeal process of 5 pigs ranging in age from 4 to 8 months were studied radiographically and histologically. Clinically, animals with a fracture of the anconeal process had a "tight," restricted gait. In pigs at 4.5 months of age, a radiolucent line through the base of the anconeal process was composed of fibrocartilage, fibrous connective tissue, and hyaline cartilage. Subperiosteal proliferation of woven bone was located along the cranial surface of the olecranon, adjacent to the base of the anconeal process. In older animals, the radiolucent line through the anconeal process contained variable amounts of fibrous connective tissue and fibrocartilage. The proliferation of subperiosteal bone at the base of the anconeal process formed a "buttress callus" which retained a radiolucent area between the callus and the proximal surface of the anconeal process. The latter region of radiolucency was continuous with the transversely oriented line that traversed the base of the anconeal process. 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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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献