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盖永霞 《畜牧兽医科学(电子版)》2021,(5):101-102
猪副嗜血杆菌病作为对猪群生长发育带来严重危害性的一种细菌性传染疾病,不仅导致猪群质量下降,降低生猪养殖产业的经济效益。猪副嗜血杆菌病不会造成猪群较高的死亡率,但是对猪群在生长发育中的抵抗能力下降,极易感染多种传染性疾病,导致症状复杂,不利于疾病的诊断。该文主要对猪副嗜血杆菌病的诊断展开分析,论述流行特点、病例变化、临床症状等,并总结猪副嗜血杆菌病的防治方法。 相似文献
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生猪养殖,是民众增收的支柱产业.这些年,随养猪政策的利好,养猪规模化、产业化发展,随之而造成的猪病蔓延,造成的经济损失不可估量.为此笔者总结不同生长阶段,猪病的发生特点,针对病情的发展,提出了掌握猪病流行,做好防病应急重点消毒管理工作,营造适宜养殖环境搞好接种防疫,增强猪群抗病体质猪场封闭化管理,降低病菌内侵可能等综合防治措施,以供参考和借鉴. 相似文献
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冬春换季时生猪疾病的暴发最为严重,常见的疾病有猪流行性腹泻、猪蓝耳病、猪瘟以及猪圆环病毒病等,这些疾病严重的降低影响了生猪的健康状况和生产性能,给生猪养殖业带来了巨大的经济损失.通过对猪常见病的患病情况以及特点进行分析可以有助于我们预防疾病,下文将对生猪养殖中常见猪病的流行特点与原因进行介绍,旨在为生猪疾病的防治带来帮助. 相似文献
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《养殖与饲料．饲料世界》2020,(8)
给猪群接种疫苗是防控传染性疾病的重要手段,但由于种种原因引起猪群免疫后发生不良反应,如果处理不及时会导致免疫失败,甚至造成猪只死亡。为此,本文简述了猪群免疫后的不良反应、发生原因;提出了应对措施:选用合格厂家生产的优质疫苗,制定科学合理的免疫程序,提前准备好肾上腺素等过敏性药物,定期对猪群进行抗体检测。供生猪养殖者参考。 相似文献
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作为一种多发、常发于农村的疫病,猪喘气病通常以散养型生猪为主要感染群体,本质上是一种呼吸道疾病,由猪肺炎支原体侵犯而发病,喘气与咳嗽是最主要的症状表现.由于猪喘气病对养猪户与养猪场均有较大的危害,可使猪群发育不良、猪肉品质下降,使养殖者遭受经济损失,所以各养猪场、养猪户均致力于此病的防治.本文试探讨猪喘气病在现阶段的主要防治措施. 相似文献
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猪高热病属于一种猪的是传染性疾病,是生猪综合型疫病,感染该疾病后的生猪主要临床病状为持续性高热。生猪高热病的病状特点表现为:急性、热性、高致病性、致死性。一直以来,生猪高热病的防治是养猪专业户在夏季主要关心的问题,如何有效防治生猪高热病是控制猪夏季传染病的关键。本文主要围绕生猪高热病症状与防治措施展开论述,并对生猪高热病诱因、病原及流行特点等问题进行分析,旨在探讨有效防治生猪高热病的措施。 相似文献
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《中国畜牧兽医文摘》2015,(1)
<正>随着生猪养殖规模的不断扩大,猪病防治成为科学养殖的关注焦点。目前的猪病防治过程中,由于环境消毒不彻底、生物安全措施不到位等因素的影响,一旦猪体遭遇强毒力野毒(细菌)侵袭,往往由单一的病原体所致疾病转为两种或多种传染性病原体所致的多重感染或混合感染,造成猪病混合感染的病例明显增多,并导致猪群的高发病率和高死亡率。这些混合感染病例的出现,使着国内养猪生产中流行的猪病更为复杂,也给疾病诊断和 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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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
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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