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猪疫病具有传染性强的特点,猪疫病一经发现,就必须及时采取措施加以控制,以减少猪疫病扩散的机率,最大限度地减少猪疫病造成的损失.本文重点论述了猪疫病的发生特点及防治对策. 相似文献
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近年来，乐都县规模养猪场不断增多，规模不断扩大。但一些养猪场对科学的饲养管理和疫病防治重视不够，或囿于专业知识的不足，使猪群疫病未能得到及时的科学防治，从而引发猪群死亡率增高，经济损失严重。兹就我县猪病发病特点、免疫工作中存在的问题及对策，浅析如下，供各养殖场参考。 相似文献
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高德强 《畜牧兽医科技信息》2019,(5):123-123
正猪群感染疫病不仅影响养殖户经济收入,对猪肉制品安全也会产生一定影响。因此,猪群疫病的防控得到了重视,猪群疫病成为研究重点。不同疫病在病发特点、发展等方面存在一定不同,需要掌握这些特征,制定适合的防控措施才能实现健康养殖。1猪群疫病发病特征1.1疫病类型诸多据调查显示,我国动物传染性疫病达到上百种,一类疫病包含口蹄疫、猪瘟。二类疫病如狂犬病、魏氏梭菌病,10种 相似文献
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近年来，养猪业不断朝规模化、集约化、现代化方向发展，随之猪的传染病也越来越猖厥，并出现新的特点，因此在防病治病方面应采取相应的措施。1猪疫病流行特点1．1传染性疾病危害越来越严重以往传统饲养方式，猪群规模小，密度低，疫病的传播受到一定限制，如能及时采取措施，就可尽快扑灭。现在一些集约化猪场群体大，一旦疫病侵入，就会波及全群，引起暴发流行，造成很大经济损失。实际生产中传染性疾病占整个猪病的50％以上。因此防治猪的传染性疾病是猪病防治的主要内容。1·2非典型性疾病不断出现重要的传染病通过免疫接种，使之得到… 相似文献
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2011年我国猪病流行特征分析 总被引：2，自引：0，他引：2
通过流行病学调查和实验室监测数据分析,认为2011年我国猪群疫病有以下特点：一是腹泻病成为影响猪群的重要疫病,二是多重感染非常普遍,三是圆环病毒感染居高不下,四是繁殖障碍仍然严重影响猪群,据此提出了加强管理、合理使用疫苗和兽药等疫病防控的具体措施,并期望猪伪狂犬病能成为下一个净化的疫病。 相似文献
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一直以来,猪疫病都是影响生猪饲养产业正常运行发展的常见问题,猪疫病所具有的传染性强特征极为明显,往往一经发现便要立即采取针对性防治措施,才能有效降低猪疫病危害.本文将对猪疫病的发生特点及防治对策进行全面分析,并结合实际做好相应整理和总结. 相似文献
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曾太 《畜牧兽医科学(电子版)》2019,(4):135-136
生猪集约化规模化养殖产业不断向前发展、养殖规模扩大的同时,猪疫病呈现高发趋势,各个生猪养殖主产区的猪疫病发生率越来越高,多种疫病发生呈现新的流行特点。猪伪狂犬病是由伪狂犬病病毒感染引起的一种高度接触性传染性疾病,该种疾病易感种类数量多,危害面积广,传染形式多样化,防治难度越来越大。该文结合实际工作经验,分析了猪伪狂犬病的流行特点、临床症状、病理学变化、诊断方法和防控措施。 相似文献
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随着国民经济的快速发展,生猪养殖业已成为我国国民经济中的主要产业,生猪养殖业的发展不仅提高了国民的生活水平,同时具有带动当地经济发展的作用,但在生猪养殖规模不断扩大的情况下,猪疫病发病率也呈现明显的上升趋势.本文主要对猪疫病发生的特点进行分析,并在此基拙上提出有效防治猪疫病的策略,以降低猪疫病的发生率. 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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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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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
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Billinghurst RC Brama PA van Weeren PR Knowlton MS McIlwraith CW 《American journal of veterinary research》2004,65(2):143-150
OBJECTIVE: To determine whether serum concentrations of biomarkers of skeletal metabolism can, in conjunction with radiographic evaluation, indicate severity of osteochondrosis in developing horses. ANIMALS: 43 Dutch Warmblood foals with varying severity of osteochondrosis. PROCEDURE: 24 foals were monitored for 5 months and 19 foals were monitored for 11 months. Monthly radiographs of femoropatellar-femorotibial and tibio-tarsal joints were graded for osteochondral abnormalities. Serial blood samples were assayed for 8 cartilage and bone biomarkers. At the end of the monitoring period, foals were examined for macroscopic osteochondrosis lesions. RESULTS: Temporal relationships were evident between certain serum biomarkers and osteochondrosis severity in foals during their first year. Biomarkers of collagen degradation (collagenase-generated neoepitopes of type-II collagen fragments, type-I and -II collagen fragments [COL2-3/4C(short)], and cross-linked telopeptide fragments of type-I collagen) and bone mineralization (osteocalcin) were positive indicators of osteochondrosis severity at 5 months of age. In foals with lesions at 11 months of age, osteochondrosis severity correlated negatively with COL2-3/4C(short) and osteocalcin and positively with C-propeptide of type-II procollagen (CPII), a collagen synthesis marker. Radiographic grading of osteochondrosis lesions significantly correlated with macroscopic osteochondrosis severity score at both ages and was strongest when combined with osteocalcin at 5 months and CPII at 11 months. CONCLUSIONS AND CLINICAL RELEVANCE: The ability of serum biomarkers to indicate osteochondrosis severity appears to depend on stage of disease and is strengthened with radiography. In older foals with more permanent lesions, osteochondrosis severity is significantly related to biomarker concentrations of decreased bone formation and increased cartilage synthesis. 相似文献